Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures; Symptom: The Pressure At The Tapping Point Is Temporarily Unusually High; Symptom: Tank Disinfection Function Is Not Completed Correctly (Ah-Error); Symptom: Boiler Abnormality Detection (Hj-11 Error) - Daikin INTERGAS Altherma NHY2KOMB28AA Installer's Reference Manual
Table of Contents
15 Troubleshooting
15.4.6
Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
Gas boiler operation is not
activated
The gas boiler equilibrium
temperature has not been
configured correctly
There is air in the system.
15.4.7
Symptom: The pressure at the tapping
point is temporarily unusually high
Possible causes
Failing or blocked pressure relief
valve.
15.4.8
Symptom: Tank disinfection function is
NOT completed correctly (AH-error)
Possible causes
The disinfection function was
interrupted by domestic hot water
tapping
Large domestic hot water tapping
happened recently before the
programmed start-up of the
disinfection function
Installer reference guide
88
Corrective action
Check and make sure that:
▪ The gas boiler is switched On
and is NOT in standby mode.
▪ The
communication
cable
between the gas boiler and the
outdoor
unit
is
properly
mounted.
▪ There is no error code on the
gas boiler display.
Increase the "equilibrium
temperature" to activate gas
boiler operation at a higher
outdoor temperature. Go to:
▪ [A.5.2.2]
>
Installer
settings > Heat sources >
Boiler
>
Equilibrium
temp. OR
▪ [A.8] > Installer settings
> Overview settings [5‑01]
Purge air manually or
automatically. See the air purge
function in the "Commissioning"
chapter.
Corrective action
▪ Flush and clean the complete
tank
including
the
piping
between pressure relief valve
and the cold water inlet.
▪ Replace the pressure relief
valve.
Corrective action
Program the start-up of the
disinfection function when the
coming 4 hours NO domestic hot
water tapping is expected.
When the Domestic hot water
> Type > Reheat or Reheat +
sched. is selected, it is
recommended to program the
start-up of the disinfection
function at least 4 hours later
than the last expected large hot
water tapping. This start-up can
be set via the installer settings
(disinfection function).
When the Domestic hot water
> Type > Scheduled only is
selected, it is recommended to
program a Storage eco 3 hours
before the scheduled start-up of
the disinfection function to
preheat the tank.
Possible causes
The disinfection operation was
stopped manually: with the user
interface displaying the DHW
home page and its user
permission level set to
Installer, the
button was
pressed during disinfection
operation.
15.4.9
Symptom: Boiler abnormality detection
(HJ-11 error)
Possible causes
Communication cable problem
Boiler error
15.4.10 Symptom: Boiler/hydrobox combination
abnormality (UA-52 error)
Possible causes
Boiler/hydrobox mismatch
Incompatibility of software
15.4.11 Symptom: The burner does NOT ignite
Possible causes
Gas tap is closed.
Air in the gas tap.
Gas supply pressure too low.
No ignition.
No spark. Ignition unit on gas
valve faulty.
Gas/air adjustment NOT correctly
set.
Fan faulty.
Fan dirty.
Gas valve faulty.
15.4.12 Symptom: The burner ignites noisily
Possible causes
Gas supply pressure too high.
Incorrect ignition gap.
Gas/air adjustment NOT correctly
set.
Corrective action
Do NOT press the
button
while the disinfection function is
active.
Corrective action
Mount the communication cable
between the gas boiler and the
outdoor unit properly.
Check the boiler display for error
information.
Corrective action
Make sure that the . setting is
set to 0.
Update the boiler and hydrobox
software to the latest version.
Corrective action
Open the gas tap.
Remove air from the gas pipe.
Contact the gas supply company.
Replace the ignition electrode.
▪ Check the cabling.
▪ Check the spark plug cap.
▪ Replace the ignition unit.
Check the adjustment. See
"To
check the carbon dioxide
setting" on
page 75.
▪ Check the wiring.
▪ Check the fuse. If necessary,
replace the fan.
Clean the fan.
▪ Replace the gas valve.
▪ Re-adjust the gas valve, see
"To check the carbon dioxide
setting" on
page 75.
Corrective action
The house pressure switch may
be faulty. Contact the gas
company.
▪ Replace the ignition pin.
▪ Check the ignition electrode
gap.
Check the setting. See
"To check
the carbon dioxide setting" on
page 75.
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
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