Table of Contents
Code
Malfunction /
error message
Display Internal
Temporary internal
E9000
—
message
E9001
80
Fault T-return
Fault feed flow
E9002
81
sensor
E9003
89
Fault frost protec
E9004
7H
Fault volume flow FlowSensorFLS
Feed temperature
E9005
8F
t
> 75 °C
V, BH
Feed temperature
E9006
8H
t
> 65 °C
V, BH
E9007
A1
IU main board def
Coolant tempera-
E9008
A5
ture
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
8
Component/
Designation
Not relevant for proper system operation.
—
Sensor or connecting cable defective.
Return flow temperature
sensor t
● Check, replace.
R2
Sensor or connecting cable defective.
Feed temperature sen-
sor t
or t
● Check, replace.
V1
V, BH
Measured value t
– Failure of the frost protection function for the plate heat
Plate heat exchanger
(PWT)
– Failure of the frost protection function for the plate heat
Water flow is too low or non-existent. Required minimum water flow
rate:
"Heating" operating mode
"Cooling" operating mode
Automatic defrost function active
Check the following items:
● All stop valves of the water circuit must be completely open.
● Optional water filters must not be contaminated.
● Heating system must run within its operating range.
● Heating system and internal circulation pump must be
● On the controller (rotary switch position "Info"
● Check function of the 3-way switch valve 3UVB1 (compare
● Does this fault occur during defrosting in room heating or hot
● Check fuses (pump fuse (FU1) on printed circuit board A1P
● Check flow sensor FLS (outdoor unit) for soiling and function; if
● Frost damage on the plate heat exchanger (outdoor unit)
Feed temperature sen-
Feed temperature of backup heater (t
sor t
V, BH
– Feed temperature sensor delivers incorrect values. Temperature
Feed temperature sen-
sor t
V, BH
Communication between heat pump outdoor unit and internal unit
disturbed.
– Electromagnetic influences.
Printed circuit board A1P
(outdoor unit)
– Printed circuit board A1P defective.
– EEPROM read error
Refrigerant temperature outside of the valid range
Temperature sensor
No heat consumption at the plate heat exchanger.
(refrigerant fluid side) t
L2
● Check flow rate.
● If flow rate is OK, replace refrigerant temperature sensor.
x
Errors, malfunctions and messages
Causes and possible fault elimination
< 0°C
V1
exchanger because the water flow is too low. See fault code
E9004 / 7H.
exchanger because there is a lack of refrigerant in the system.
See fault code E9015 / E4.
completely vented.
whether sufficient water pressure (> 0.5 bar) is available; if
necessary, top up heating water.
actual position of 3UVB1 with indicated position BPV in
parameter [Overview]).
water preparation operating mode? With optional backup heater:
check its power supply and fuses.
(outdoor unit) and conductor plate fuse (F1) on RoCon BM2C
printed circuit board).
necessary, clean, replace.
sensor or connecting cable defective.
● Check, replace.
● Perform reset.
● Replace printed circuit board A1P.
5-7 kW
11-16 kW
480 l/h
600 l/h
600 l/h
900 l/h
780 l/h
900 l/h
), check
) is too high.
V, BH
Installation and maintenance instructions
51
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