Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual
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Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual

Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual

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Summary of Contents for Vaillant ecoTEC plus VU Series

  • Page 1 ecoTEC plus VU../VUW.. en Installation and maintenance instructions...
  • Page 2 Installation and maintenance Calling up the data overview ....... 39 Calling up status codes........39 instructions Exiting the menu level.......... 39 Contents Running the chimney sweep mode (combustion analysis) .......... 39 8.10 Switching on the button lock (Advanced Key Safety ..............4 Lock) ..............
  • Page 3 13.5 Resetting parameters to factory settings ..... 59 13.6 Eliminating faults in the product......60 13.7 Replacing defective components......60 Decommissioning..........68 14.1 Activate the standby mode ........68 14.2 Temporarily decommissioning......68 14.3 Permanently decommissioning......68 Disposing of the packaging......68 Appendix ................
  • Page 4 – Any use other than those described in Safety these instructions and any use that goes Intended use beyond what is described here The product is intended as a heat generator Qualification for sealed heating installations and for do- mestic hot water generation. The person carrying out the work described here must have completed professional train- Improper use of any kind is prohibited.
  • Page 5 ▶ Do not use naked flames (e.g. lighters, ▶ Open all accessible doors and windows matches). fully to provide ventilation. ▶ Do not smoke. ▶ Switch off the product. ▶ Do not use any electrical switches, mains ▶ Check the flue gas routes in the product plugs, doorbells, telephones or other com- and the flue gas diversions.
  • Page 6 ▶ If you are installing the product in To prevent burns: hairdressing salons, painter's or joiner's ▶ Always ensure that no high temperatures workshops, cleaning businesses or similar are present, and only work on components locations, choose a separate installation once they have cooled down sufficiently.
  • Page 7 List of relevant standards for Great Britain and Ireland ▶ Observe the national regulations, stand- ards, directives, ordinances and laws. You can find a list of relevant standards at: https://www.vaillant.co.uk/standards 0020308118_05 Installation and maintenance instructions...
  • Page 8 To register your Vaillant appliance visit: https://self-service.vaillant.co.uk/warranty-registration Vaillant is a licensed member of the Benchmark Scheme. Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer’s instructions by a competent person approved at the time by the Health and...
  • Page 9 Technical data During initial start-up, the operating data may initially deviate from the specified nominal data. Technical data – General VU 10 VU 15 VU 20 Designated country (designation in accordance with GB, IE GB, IE GB, IE ISO 3166) Permitted gas boiler category (depending on the unit version) 2H3P 2H3P...
  • Page 10 VU 25 VU 30 VU 35 Weight (without packaging, without water) 36 kg 36 kg 40.5 kg Weight ready for operation (filled) 41 kg 41 kg 44 kg VUW 20/26 VUW 25/32 VUW 30/36 Designated country (designation in accordance with GB, IE GB, IE GB, IE...
  • Page 11 VUW 30/40 Weight (without packaging, without water) 41 kg Weight ready for operation (filled) 48 kg Technical data – G20 output/heat input (depending on the unit version) VU 10 VU 15 VU 20 Gas connection pressure, G20 natural gas 2.0 kPa 2.0 kPa 2.0 kPa (20.0 mbar)
  • Page 12 VUW 20/26 VUW 25/32 VUW 30/36 Gas flow rate for max. gas volume at 15 °C and 1013 mbar, 2.80 m³/h 3.45 m³/h 3.88 m³/h Nominal heat output range at 40/30 °C 2.9 to 21.7 kW 4.0 to 26.9 kW 4.3 to 32.9 kW Nominal heat output range at 50/30 °C 2.8 to 21.2 kW...
  • Page 13 VU 10 VU 15 VU 20 Max. flue gas mass flow rate 9.78 g/s 9.78 g/s 11.99 g/s (35.21 kg/h) (35.21 kg/h) (43.16 kg/h) Max. DHW heat output 19.5 kW 19.5 kW 23.3 kW DHW nominal heat input 20.4 kW 20.4 kW 24.5 kW Nominal heat input range for heating...
  • Page 14 VU 10 VU 15 VU 20 Permissible operating pressure, heating 0.25 MPa 0.25 MPa 0.25 MPa (2.50 bar) (2.50 bar) (2.50 bar) Nominal circulation water volume based on ΔT = 20 K, 439 l/h 659 l/h 878 l/h 80/60 °C Approx.
  • Page 15 VUW 30/40 Start-up flow rate 2.0 l/min Specific flow rate D (ΔT = 30 K) (EN 13203-1) 19.0 l/min Flow rate (ΔT = 35 K) 16.3 l/min Permissible operating pressure 0.95 MPa (9.50 bar) Required connection pressure 0.07 MPa (0.70 bar) 35 to 65 ℃...
  • Page 16 Gas Council Numbers Hot Water Association VU 10CS/1-5 (N-GB) ecoTEC plus 610 41-694-45 Vaillant is a full member of the Hot Water Association and VU 15CS/1-5 (N-GB) ecoTEC plus 615 41-694-46 promotes the scheme in association with its cylinder range.
  • Page 17 Data plate Information Meaning Permissible operating pressure, heating mode Maximum output power (For boiler only) Permissible operating pressure for do- mestic hot water mode (For combi boiler only) Specific domestic hot water flow rate value (For combi boiler only) Device specific number NOx-class NOx class (nitrogen oxide emissions) Maximum flow temperature...
  • Page 18 – Seasonal weather effects Electronics box Control electrode Hydraulic block Heat exchanger – Various tolerances of unit-internal components Ignition electrode The values can be read in the following time forms: Gas valve assembly Air intake pipe – Today Compact thermal Temperature sensor –...
  • Page 19 If the boiler does not resume normal operation press the reset button. If the boiler does not resume normal operation after this call your Installation/Servicing company or Vaillant service. 5.11.2 Overheating Safety The boiler software is designed to recognise the potential for an overheat lockout and will shutdown before this happens.
  • Page 20 Dimensions Quantity Designation Heating flow and return connection pipe, 20 mm diameter VU 10 125 mm 352 mm 440 mm 720 mm Service valve VU 15 125 mm 352 mm 440 mm 720 mm Bag with small parts VU 20 125 mm 352 mm 440 mm...
  • Page 21 Minimum clearances Wall-mount the product on the unit mounting bracket. Minimum clearance 60/100 mm diameter air/flue pipe: 165 or 248 mm. → See mounting template Installation 80/125 mm diameter air/flue pipe: 276 mm Prerequisites 180 mm 5 mm 7.1.1 Gas supply 500 mm in front of the heat generator to enable In the planning phase, consult the local gas supply company easy access for maintenance work (may be...
  • Page 22 7.1.3 Using the correct gas type Note The subsequent check is an approximation Operating with a gas type from the incorrect gas family, may method, which does not replace a detailed cause fault shutdowns in the product. Ignition and combus- technical design.
  • Page 23 In GB the minimum acceptable siting dimensions for the Validity: Product with integrated hot water generation terminal from obstructions, other terminals and ventilation openings are shown in diagram overleaf. Condition: External expansion vessel installed and warm start active In IE the minimum distances for flue terminal positioning ▶...
  • Page 24 7.2.3 Position of the air/flue terminal 7.2.3.1 Positioning the terminal of a fan-supported flue system Installation site Dimensions Adjacent to a boundary. 300 mm The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is 25 mm extended to clear any overhang.
  • Page 25 Installation site Dimensions The dimension below eaves, balconies and car ports can be reduced to this value, as long as the flue terminal is 25 mm extended to clear any overhang. External flue joints must be sealed with suitable silicon sealant. Above adjacent ground or balcony.
  • Page 26 7.2.4.3 Vertical Concentric Flue ⌀ 60/100 mm or 7.2.4 Flue Configuration Description ⌀ 80/125 mm (C33 type installation) 7.2.4.1 Horizontal Concentric Flue ⌀ 60/100 mm or ⌀ 80/125 mm (C13 type installation) Gasket (fitted) Consult the separate installation manual for air/flue gas sys- Note tems supplied with your appliance for all possibilities and as- If the terminal is at less than 2.0 m from the...
  • Page 27 7.2.6 Replacing the standard connector for the Condition: Gas isolation valve with test nipple (requirement for BS 6891) air/flue pipe, where required 7.2.6.1 Removing the standard connector for the air/flue pipe ▶ Connect the product to the gas pipe as shown in accord- ance with the recognised rules of good engineering prac- tice.
  • Page 28 Technical data – gas isolation valves Installing the heating flow and heating return Tech- Article Article Article Article Validity: Product with connected domestic hot water cylinder nical number number number number data in 082778 0020325741 082786 0020325742 accord- 15–15 15–15 mm 15–22 15–22 mm ance...
  • Page 29 ▶ 7.8.1.1 Direct Connection to internal soil and vent For the condensate discharge pipe, use pipes that have an internal diameter of at least 19 mm (30 mm internal stack diameter for all of those that are led out of the building). –...
  • Page 30 7.8.1.7 External termination into rain water down Preferred option for external termination pipe 7.8.1.5 External termination into soakaway Ø32mm ≤ 3 m ≤ 3 m ≥ 500 mm Ø22mm 100 mm Ø 32mm Ø12 NB only combined foul/rainwater drain 7.8.1.8 Additional methods of introducing air breaks Ground (either/or) Bottom of sealed tube Seal...
  • Page 31 ▶ Installing combined condensate and Check that there is no voltage. Use test pressure relief valve equipment approved to GS38 to confirm that the electricity supply is disconnected. All work must comply with the current IET Wiring Regula- tions. The isolator shall be situated next to the appliance for new systems and, where practicable, replacement appliances.
  • Page 32 7.10.2 Removing the front casing Install the product outside of zones 0 and 1 (BS 7671) (figure only used as a guide). In all cases the installation must be in accordance with the latest amendments to the latest edition of the IET Wiring Regulations (BS 7671).
  • Page 33 7.10.3 Opening the electronics box 7.10.5 General information 7.10.5.1 Requirements for the mains voltage and sensor lines Observe the following requirements for the mains voltage and sensor lines: Line cross-section ≥ 1.5 mm² Supply line for mains voltage (pump or mixer (≥...
  • Page 34 7.10.5.4 Stripping the cables correctly 24V / eBus 230 V ≥ 4 6 – ≥ 3 230V 6 – Correctly route the connection cables for the compon- 0 – 30 V ents that are to be connected in the electronics box: 24 V/ eBUS ->...
  • Page 35 – Power supply: Single-phase, 230 V, 50 Hz Slot Item Function – Fuse protection: ≤ 3 A RT 230V Mains main power supply 230 V Do not interrupt the mains supply with a time switch or input programmer. Caution. For the power supply cable, use a flexible three-core Risk of material damage due cable that complies with the relevant standards, which to high connected voltage.
  • Page 36 When using the eBUS, the bridge at the 24 V RT plug The plug-in connection for connecting a Vaillant cylinder must be inserted. temperature sensor (1) is not located on the PCB, but rather on the wiring harness on the bottom left in the product.
  • Page 37 Smart room controls are available when an eBUS room con- trol and a suitable Vaillant gateway are present. The room control can be set and operated using the Vaillant app. For connection, follow the instructions in the enclosed installation instructions.
  • Page 38 7.11 Installing the front casing Calling up the installer level Navigate to MENU → SETTINGS → Installer level and confirm by pressing Set the code for the installer level and confirm by pressing – Code for Installer level: 17 8.2.1 Exiting the installer level ▶...
  • Page 39 – Electrical Min. heat input Check the wiring of controls is correct Confirm by pressing (Vaillant eBUS) or third party controls ◁ If you have selected Adjustable heat load, set the Correct cable size and type have been used desired heat load and confirm by pressing ◁...
  • Page 40 Checking and treating the heating Num- Check water/filling and supplementary water (✓) Isolation is via a double pole switched Caution. fused spur or 3 pin fused plug in unswitched shuttered socket Risk of material damage due to poor-qual- ity heating water Flue system ▶...
  • Page 41 Running through the installation assistant Caution. Risk of material damage if the heating The installation assistant is launched when the product is water is treated with unsuitable additives. switched on for the first time. After starting the installation assistant, all of the product's re- Unsuitable additives may cause changes in quirements are blocked.
  • Page 42 Guaranteeing the system pressure If the heating installation covers multiple storeys, higher val- ues than the permissible operating filling pressure may be necessary for the filling pressure in order to prevent air from getting into the heating installation. This static height is the height difference in metres between the heat generator and the highest heating area for a cellar installation or the lowest heating area for a rooftop control system.
  • Page 43 ▶ Filling the heating installation Purge the lowest radiator until water flows out of the purging valve without bubbles. Start check programme P.008. (→ Section 8.4) ▶ Purge all other radiators until the entire heating sys- ◁ The prioritising diverter valve moves to the mid- tem has been filled with water.
  • Page 44 9.12 Filling the condensate siphon Never fill the condensate siphon via the air/flue con- nector. Loosen the lower section of the siphon (3) by turning the upper section of the siphon (1) by a quarter turn and pull it downwards and out. Remove the float (2).
  • Page 45 Result 2: The product design is compatible with the local gas group. ▶ Check the gas connection pressure/gas flow pres- sure. (→ Section 9.13.3) ▶ Check the O₂ content. (→ Section 9.13.4) 9.13.2 Checking the air/flue pipe/flue gas recirculation Check whether the front casing (vacuum chamber) has been closed tightly.
  • Page 46 Hinge the electronics box upwards. Open the test opening at the flue gas analysis point. Position the measuring probe for the flue gas analyser. Check the noted measured value against the manufac- Start chimney sweep mode (→ Section 8.9). turer details. Ensure that the heat load is correct.
  • Page 47 Validity: VU 35CS/1-5 (N-GB) ecoTEC plus 635 OR VUW 30/40CS/1-5 (N-GB) H gas in m³/h Qnw from the data ecoTEC plus 840 plate −10% Nom. 15.3 1.62 1.70 1.46 18.4 1.95 2.05 1.76 24.7 2.61 2.74 2.35 25.7 2.72 2.86 2.45 28.6 3.03...
  • Page 48 9.15 Checking the heating mode Ensure that there is a heat demand. Navigate to MENU → SETTINGS → Installer level → Data overview. ◁ If the product is working correctly, the display shows S.004. 9.16 Checking the domestic hot water generation Make sure that there is a domestic hot water demand.
  • Page 49 – 10.3 Adapting the heating mode settings Pump overrun – Pump mode 10.3.1 Heat input After the burner stops, the pump overrun can be defined in During operation, the heat input is continuously adjusted to real time via diagnostics code D.001. the required heat output for the heating system.
  • Page 50 Set maximum burner anti-cycling time (tar- [min] Flow get) [°C] 29.0 33.1 37.2 41.3 45.4 49.5 D.171 D.172 + 173 + 174 D.175 26.0 29.6 33.3 36.9 40.5 44.2 23.0 26.2 29.4 32.5 35.7 38.9 20.0 22.7 25.5 28.2 30.9 33.6 17.0 19.3...
  • Page 51 Position of the Decoupling of the heat generator Pressure Comment from the heating system (low loss adjusting screw …. header, plate heat exchanger, buffer If the radiators Right-hand stop cylinder) 0.035 MPa do not heat up (turned all the way sufficiently at the (0.350 bar) down)
  • Page 52 10.3.8 Setting the heat curve Validity: VU 35CS/1-5 (N-GB) ecoTEC plus 635 OR VUW 30/40CS/1-5 (N- GB) ecoTEC plus 840 1000 1200 1400 1600 Pressure [mbar] Flow rate [l/h] Minimum pressure Factory setting Maximum pressure Outdoor temperature °C Target flow temperature °C Underfloor heating The figure shows the possible heat curves of 0.1 to 4.0 for a...
  • Page 53 10.4 Adapting the domestic hot water settings 10.5 Displaying the product information 10.4.1 Setting the domestic hot water temperature You can call up current product status information by scan- ning a QR code using the myVAILLANT pro app. ▶ Validity: Product with integrated hot water generation OR Product with Download the free myVAILLANT pro app onto your mo- connected domestic hot water cylinder bile device from Google Play®...
  • Page 54 ▶ 12.4 Actuator test Inform the end user that they must not store or use explo- sive or highly flammable substances (such as petrol, pa- MENU → SETTINGS → Installer level → Test modes → Ac- per or paint) in the installation room of the product. tuator test ▶...
  • Page 55 12.7 Removing/installing the compact thermal module Burner flange Gas valve assembly Premix burner Ignition transformer Control electrode Ignition electrode Speed-regulated fan Unscrew the air intake pipe (1) from the upper retainer and remove the air intake pipe from the intake stub, as Note shown in the figure.
  • Page 56 Result: Heat exchanger dirty ▶ Clean the heat exchanger. (→ Section 12.8.2) Check the insulating mat on the heat exchanger for damage. Result: Insulating mat damaged ▶ Replace the insulating mat (→ Spare parts instruc- tions for the heat exchanger insulating mat). 12.7.2 Installing the compact thermal module Reconnect the plug or, if required, the two plugs to the fan motor (2).
  • Page 57 12.8.2 Cleaning the heat exchanger 12.8.4 Checking and, if required, supplementing the pre-charge pressure for the internal expansion vessel Drain the product. (→ Section 12.9) Check the pre-charge pressure of the expansion vessel at the expansion vessel valve (1). Never undo the four nuts on the stud bolt or tighten –...
  • Page 58 Pull the assembly straight out of the product without any rotational movement. Disconnect the lowest section of the assembly by rotating the upper section. Note the installation position. Remove the flow rate limiter (1), O-ring (2) and strainer (3). Rinse the strainer under a jet of water, holding it against the direction of flow.
  • Page 59 12.10 Completing inspection and maintenance 13.3.2.1 Requesting/clearing the fault history work Call up the installer level. (→ Section 8.2) ▶ Start a test operation after the maintenance. Navigate to the Fault history menu. ▶ ◁ Check the heating mode and, if required, the domestic The display shows the number of faults that have hot water generation (if available).
  • Page 60 Check the installation-specific settings and adjust these. Exit the diagnostics codes. (→ Section 8.3.1) Exit the menu level. (→ Section 8.8) 13.6 Eliminating faults in the product 2×1 Note Maximum number of repetitions: 3. ▶ Press and hold for longer than three seconds and release the button.
  • Page 61 13.7.3 Replacing the pump head 13.7.4 Eliminating the condensate discharge blockage (F.028 or F.029) Pull out the plugs (5) and (6) from the pump head. Undo the four screws (4). Remove the pump head (3). Check the inside of the lower section of the pump (1) for dirt.
  • Page 62 Remove the compact thermal module. (→ Section 12.7.1) Remove the ignition electrode. (→ Section 13.7.13) Turn the two screws (5) between the burner flange (6) and the fan. Remove the burner flange. Fit the new burner (3) with a new burner seal (2) to the Remove the plug or, if required, the two plugs from the new burner flange.
  • Page 63 13.7.7 Replacing the gas valve assembly If the offset that you read has five digits, set dia- gnostics code D.052 using the first three digits. Removing the gas valve assembly (→ Section 8.3) If the offset that you read has three digits, set diagnostics code D.052.
  • Page 64 Insert the new heat exchanger into the grooves on the back panel. Screw in a new screw tightly on the underside of the heat exchanger. If you have removed an existing front retainer, use two screws each to screw the retainer in tightly. Secure the condensate discharge hose on the heat exchanger.
  • Page 65 Use a mirror, for example. ▶ Avoid damaging the burner insulating mat on the back panel of the combustion chamber cover. Vaillant GmbH Vaillant GmbH Berghauser Str. 40 42859 Remscheid, Germany Berghauser Str. 40 42859 Remscheid, Germany ▶...
  • Page 66 burner insulating mat on the rear of the combustion Remove the sealing residue from the burner flange. chamber cover. Remove the sealing residue from the burner flange. Caution. Risk of material damage caused by touch- Caution. ing and cleaning. Risk of material damage caused by touch- The electrode may emit incorrect signals due ing and cleaning.
  • Page 67 Socket cable Power supply cable Validity: VU 10CS/1-5 (N-GB) ecoTEC plus 610 OR VU 15CS/1-5 (N-GB) ecoTEC plus 615 OR VU 20CS/1-5 (N-GB) ecoTEC plus 620 Cable for 230 V fan OR VU 25CS/1-5 (N-GB) ecoTEC plus 625 OR VU 30CS/1-5 (N-GB) ecoTEC plus 630 OR VUW 20/26CS/1-5 (N-GB) ecoTEC plus 826 OR VUW 25/32CS/1-5 (N-GB) ecoTEC plus 832 OR VUW 30/36CS/1-5 (N-GB) Install the wiring harnesses as shown in the figure.
  • Page 68 Check that the 230 V voltage is no longer present in the product. 15 Disposing of the packaging ▶ Dispose of the packaging correctly. ▶ Observe all relevant regulations. ▶ For detailed information refer to www.vaillant.co.uk. Installation and maintenance instructions 0020308118_05...
  • Page 69 Appendix Tightening torques Manufacturer's recommendation for the tightening torques Component Value Unit Gas valve assembly, union 60° Degrees Burner, fixing screws Fan flange, mixture pipe screws Fan, gas valve assembly screws Gas valve assembly, test nipple screw plug Gas isolation valve, test nipple screw plug Ignition electrode, fixing screws...
  • Page 70 Maintenance work Interval Check that the condensate pipe is in good condition, that it is leak-tight Annually and that the drain is correct Check whether all of the externally routed condensate pipes are dimen- Annually sioned correctly and have been insulated sufficiently (frost protection) Check whether the gas flow rate corresponds with the specifications on Annually the data plate and lies within the tolerances specified in these instructions...
  • Page 71 Installer level Note Since the code table is used for various products, some codes or some steps may not be visible in the installation assistant. Setting level Values Factory Unit Increment, select, explanation setting Min. Max. Enter access code 1 (competent person code 17) Data overview Current value Installation assistant...
  • Page 72 Setting level Values Factory Unit Increment, select, explanation setting Min. Max. → T.001 - T.007 Current value You can find more detailed information in the table of actuator tests. Diagnostics codes → D.XXX - D.XXX Current value You can find more detailed information in the table of diagnostics codes.
  • Page 73 Diagnostics code Values Setting Unit Increment, select, explanation Min. Max. Factory Current D.000 Product- Adjustable partial heat load: The dependent adjustment range can be viewed in Maximum load in heating mode the technical data. Not all products have an adjustment range. Auto Auto: Product automatically adjusts the max.
  • Page 74 Diagnostics code Values Setting Unit Increment, select, explanation Min. Max. Factory Current D.023 Current value Off, On Status of the heat demand D.025 Current value Off, On Status of the eBUS control's domestic (Displayed if a control is connected.) hot water demand D.026 1: Circulation pump Function of internal additional relay...
  • Page 75 Diagnostics code Values Setting Unit Increment, select, explanation Min. Max. Factory Current D.058 3: Min. target DHW val. 60 °C Solar circuit post-heating 5: Auto Outlet temperature 40 °C: – At an inlet temperature ≤ 35 °C, the heat generator starts in order to reach the set outlet temperat- ure.
  • Page 76 Diagnostics code Values Setting Unit Increment, select, explanation Min. Max. Factory Current D.077 Output- Max. load dependent Maximum load in domestic hot water mode ℃ D.078 Maximum target flow temperature Note value for domestic hot water The chosen value must be at least 15 K or 15 °C above the set target cylinder value.
  • Page 77 Diagnostics code Values Setting Unit Increment, select, explanation Min. Max. Factory Current D.145 Current value Diagnostics code for deactivating the check of the flue gas blockage. Deactivate detection: Air/flue pipe blocked Only use this diagnostics code if the product displays fault code F.035 during the initial start-up.
  • Page 78 Diagnostics code Values Setting Unit Increment, select, explanation Min. Max. Factory Current D.166 1: Check the flow temperature sensor ADC fault index 2: Check the return temperature sensor 5: Check the heat cell coding resistor 6: Check the control electrode 7–8: Check the ignition electrode 9: Check the DHW inlet temperature sensor...
  • Page 79 Status codes Note Since the code table is used for various products, some codes may not be visible for the product in question. Code Meaning S.000 There is no demand for heating mode. S.001 Heating mode is active and the fan is in prerun mode. S.002 Heating mode is active and the heating pump is in prerun mode.
  • Page 80 Code Meaning S.092 The self-test for the circulation water volume is active. S.093 A flue gas analysis is not currently possible. S.096 The self-test for the return temperature sensor is active. The heat demands are blocked. S.097 The self-test for the water pressure sensor is active. The heat demands are blocked. S.098 The self-test for the flow and return temperature sensor is active.
  • Page 81 Code/meaning Possible cause Measure ▶ F.013 Fault in the electrical connection Check and, if required, replace the wiring harness between the for the cylinder temperature PCB and sensor, including all plug connections. The cylinder temperature sensor sensor has short-circuited. ▶ Cylinder temperature sensor Check and, if required, replace the cylinder temperature defective...
  • Page 82 Code/meaning Possible cause Measure ▶ F.024 Fault in the electrical connec- Check and, if required, replace the wiring harness between the tion for the return temperature PCB and sensor, including all plug connections. The temperature increases too sensor quickly. ▶ Flow temperature sensor de- Check and, if required, replace the flow temperature sensor.
  • Page 83 Code/meaning Possible cause Measure ▶ F.028 Fault in the flue gas route Check the entire flue gas route. caused by recirculation or flue The flame signal was not detec- gas blockage ted during the ignition phase. ▶ Ignition transformer not connec- Check the plug and the plug connection.
  • Page 84 Code/meaning Possible cause Measure ▶ F.035 Condensate pump (if fitted) Check and clean the condensate pump. Replace the condens- defective ate pump, if required. The air/flue pipe is blocked. ▶ Insufficient combustion air sup- Check the combustion air supply. ▶ Control electrode defective Check and, if required, replace the control electrode.
  • Page 85 Code/meaning Possible cause Measure ▶ F.044 Interruption in the wiring har- Check the wiring harness including all plug connections and, if ness required, replace it. The ionisation signal for the ▶ control electrode is too low. The Burner defective Check and, if required, replace the burner. drift adaptation has failed.
  • Page 86 Code/meaning Possible cause Measure ▶ F.064 Sensor defective Check the sensor displayed under D.166. ▶ The sensor signal could not be PCB defective If the displayed value for D.166 is > 20 and is not listed, re- converted correctly. place the PCB. ▶...
  • Page 87 Code/meaning Possible cause Measure F.078 Fault in the electrical connection For products without integrated domestic hot water genera- for the domestic hot water con- tion: Check whether the bridge on plug X2 betwen contacts The control centre is not sup- nection temperature sensor 2 and 5 is plugged in and is without interruption.
  • Page 88 Code/meaning Possible cause Measure ▶ F.090 Interruption in the wiring har- Check the wiring harness including all plug connections and, if ness required, replace it. Communication with the internal ▶ cylinder has been interrupted. Plug on PCB loose/not plugged Check the plug and the plug connection. ▶...
  • Page 89 Code/meaning Possible cause Measure F.096 Air-mass flow sensor dirty or Check the air-mass flow sensor for dirt. defective (only in conjunction The gas valve stepper motor If required, replace the entire air intake pipe. with the conversion set compris- has reached the maximum per- ing the air intake pipe with in- missible step number.
  • Page 90 Code/meaning Possible cause Measure ▶ F.326 3-port diverter valve defective or Check and, if required, replace the 3-port diverter valve. blocked The hydraulic sensor and actu- ▶ ator test has detected at least Plug on 3-port motorised valve Check the plug and the plug connection on the 3-port motor- two hydraulic components that loose/not plugged in ised valve.
  • Page 91 Code/meaning Possible cause Measure F.347 Condensate in the combustion Check and, if required, clean the condensate discharge pipe chamber due to a blocked con- including the siphon. Condensate has been detected densate discharge in the combustion chamber. The Check the combustion chamber (electrodes, insulating mats, burner operation is interrupted.
  • Page 92 Maintenance codes Note Since the code table is used for various products, some codes may not be visible for the product in question. Code/meaning Possible cause Measure I.003 Maintenance interval elapsed Carry out maintenance work. The product's maintenance time Reset the service interval. has been reached.
  • Page 93 Code/meaning Possible cause Measure ▶ N.027 Temperature sensor defective Check and, if required, replace the temperature sensor. The signal for the temperature Short circuit in the connection Check whether the outlet temperature displayed under sensor on the domestic hot wa- cable D.003 is 116 °C.
  • Page 94 Code/meaning Possible cause Measure N.096 Air-mass flow sensor dirty or Check the air-mass flow sensor for dirt. defective (only in conjunction The gas valve stepper motor If required, replace the entire air intake pipe. with the conversion set compris- has reached the maximum per- ing the air intake pipe with in- missible step number.
  • Page 95 Code/meaning Possible cause Measure ▶ N.270 Flow rate quantity set incor- Set the flow rate quantity on the cold water adjusting valve. rectly on the cold water adjust- The temperature spread via ing valve (only on a product the secondary heat exchanger with no factory-installed flow (heating flow –...
  • Page 96 Validity: VU 10CS/1-5 (N-GB) ecoTEC plus 610 OR VU 15CS/1-5 (N-GB) ecoTEC plus 615 OR VU 20CS/1-5 (N-GB) ecoTEC plus 620 OR VU 25CS/1-5 (N- GB) ecoTEC plus 625 OR VU 30CS/1-5 (N-GB) ecoTEC plus 630 +24V Burner X100 24V= X100 X12a X12b...
  • Page 97 Flow temperature sensor Ignition electrode Surface-mounted thermostat/Burner off Control electrode 24 V DC room thermostat Outdoor temperature sensor, flow temperature sensor (optional, external), DCF receiver Bus connection (system control/digital room thermo- Circulation pump remote control stat) Water pressure sensor Control module Cylinder temperature sensor (optional) Communication unit C1/C2 cylinder contact (optional)
  • Page 98 Validity: VU 35CS/1-5 (N-GB) ecoTEC plus 635 +24V Burner X100 24V= X100 X12a X12b X12a 230V~ Printed circuit board Control panel PCB Gas valve assembly for main gas valve Gas valve assembly Return temperature sensor Installation and maintenance instructions 0020308118_05...
  • Page 99 Flow temperature sensor Control electrode Surface-mounted thermostat/Burner off Outdoor temperature sensor, flow temperature sensor (optional, external), DCF receiver 24 V DC room thermostat Circulation pump remote control Bus connection (system control/digital room thermo- Control module stat) Water pressure sensor Communication unit Cylinder temperature sensor (optional) Internal pump C1/C2 cylinder contact (optional)
  • Page 100 Validity: VUW 20/26CS/1-5 (N-GB) ecoTEC plus 826 OR VUW 25/32CS/1-5 (N-GB) ecoTEC plus 832 OR VUW 30/36CS/1-5 (N-GB) ecoTEC plus 836 +24V Burner X100 24V= X100 X12a X12b X12a 230V~ Printed circuit board Control panel PCB Gas valve assembly for main gas valve Gas valve assembly Return temperature sensor Installation and maintenance instructions 0020308118_05...
  • Page 101 Flow temperature sensor Ignition transformer Surface-mounted thermostat/Burner off Ignition electrode 24 V DC room thermostat Control electrode Bus connection (system control/digital room thermo- Outdoor temperature sensor, flow temperature stat) sensor (optional, external), DCF receiver Water pressure sensor Circulation pump remote control Prioritising diverter valve Control module Impeller water flow sensor...
  • Page 102 Validity: VUW 30/40CS/1-5 (N-GB) ecoTEC plus 840 +24V Burner X100 24V= X100 X12a X12b X12a 230V~ Printed circuit board Control panel PCB Gas valve assembly for main gas valve Gas valve assembly Return temperature sensor Installation and maintenance instructions 0020308118_05...
  • Page 103 Flow temperature sensor Ignition electrode Surface-mounted thermostat/Burner off Control electrode 24 V DC room thermostat Outdoor temperature sensor, flow temperature sensor (optional, external), DCF receiver Bus connection (system control/digital room thermo- Circulation pump remote control stat) Water pressure sensor Control module Prioritising diverter valve Communication unit Impeller water flow sensor...
  • Page 104 Commissioning Checklist Benchmark Commissioning & Warranty Validation Service Record It is a requirement that the boiler is installed and commissioned to the manufacturers’ instructions and the data fields on the commissioning checklist completed in full. To instigate the boiler warranty the boiler needs to be registered with the manufacturer within one month of the installation.
  • Page 105 GAS BOILER SYSTEM COMMISSIONING CHECKLIST & WARRANTY VALIDATION RECORD Address: Boiler make and model: Boiler serial number: Commissioned by (PRINT NAME): Gas Safe registration number: Company name: Telephone number: Company email: Company address: Commissioning date: Heating and hot water system complies with the appropriate Building Regulations? Time, temperature control and boiler interlock provided for central heating and hot water Boiler Plus requirements (tick the appropriate box(s)) Weather compensation...
  • Page 106 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER SERVICE/INTERIM WORK ON BOILER Date:...
  • Page 107 SERVICE & INTERIM BOILER WORK RECORD It is recommended that your boiler and heating system are regularly serviced and maintained, in line with manufacturers’ instructions, and that the appropriate service / interim work record is completed. Service provider When completing a service record (as below), please ensure you have carried out the service as described in the manufacturers’ instructions. Always use the SERVICE/INTERIM WORK ON BOILER SERVICE/INTERIM WORK ON BOILER Date:...
  • Page 108 Commissioning Flow Chart PRIOR TO CO AND COMBUSTION RATIO CHECK NOTE The boiler manufacturer’s installation instructions should have been followed, gas type verified and gas THE AIR GAS RATIO VALVE IS FACTORY supply pressure/rate checked as required prior to commissioning. SET AND MUST NOT BE ADJUSTED As part of the installation process, especially where a flue has been fitted by persons other than the DURING COMMISSIONING UNLESS THIS...
  • Page 109 Index Disposal, packaging ............68 Disposing of the packaging ..........68 Documents ................16 Actuator test ............42, 54, 91 Drain pipe, expansion relief valve ........31 Calling up............... 39 Exiting ................39 Electronics box ..............33 Advanced Key Lock............. 39 Exiting the menu level ............
  • Page 110 Operating concept ............... 38 Overheating protection ............19 Overrun time, setting ............49 Post-heating ................ 53 Pre-charge pressure for the internal expansion vessel, checking ................57 Preparing, maintenance work..........54 Pressure level..............51 Product Draining ................. 58 Switching off ..............68 Product dimensions.............
  • Page 112 Supplier Vaillant Ltd. Nottingham Road Belper Derbyshire DE56 1JT Telephone 0330 100 3143 [email protected] www.vaillant.co.uk 0020308118_05 Publisher/manufacturer Vaillant GmbH Berghauser Str. 40 D-42859 Remscheid Tel. +49 2191 18 0 Fax +49 2191 18 2810 [email protected] www.vaillant.de © These instructions, or parts thereof, are protected by copyright and may be reproduced or distributed only with the manufacturer's written consent.

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