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Errors, malfunctions and messages
Daikin Altherma M ECH
2
O
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
Installation and maintenance instructions
55
E9041
U4
Transmission fault Electrical components
Communication between heat pump outdoor unit and heat pump
indoor unit disturbed.
– Wiring or connections, poor contact.
– No heat pump outdoor unit connected.
– Printed circuit board A1P (outdoor unit) defective.
– Main circuit board in the heat pump outdoor unit defective.
●
Check, replace.
E9042
U5
Communication between printed circuit board A1P (outdoor unit)
and RoCon
BM2C disturbed.
●
See fault code E200.
E9043
U7
Communication between main circuit board and inverter circuit
board in the heat pump outdoor unit disturbed.
– Main circuit board in the heat pump outdoor unit defective.
– Inverter circuit board in the heat pump outdoor unit defective.
– Wiring, poor contact.
●
Check, eliminate cause, replace.
E9044
UA
Configuration of printed circuit board A1P (outdoor unit) does not
match the heat pump outdoor unit
●
Replace printed circuit board A1P.
●
If necessary, contact a Daikin service technician.
E9045
AJ
heating time (hot
water)
Software
WW heating >
6 hours
●
Check the heating element.
●
Check whether the power supply meets the regulations. Check
for frequency fluctuations.
●
Check the fuses on the printed circuit boards.
●
Check WW consumption (poss. too high).
●
Check the building's WW tap.
●
Confirm that the software and EEPROM on the hydro printed
circuit board match.
E9046
E6
compressor start-
up
Software
System detects an abnormal electricity wave shape 16 times in
5 min
●
Check whether the power supply meets the regulations. Check
for frequency fluctuations.
●
Check the compressor.
●
Check the compressor's connection and wiring.
●
Check the operation of the expansion valve (fluid return flow).
●
Check the refrigerant filling capacity, and check for leaks.
●
After resetting the power supply, check whether the error occurs
when the compressor is not in operation: check the expansion
valve.
E9047
E8
overvoltage
Software
System detects an overcurrent of >
20
A to the compressor for
>
2.5
seconds 16 times in 5
min
●
Check the compressor.
●
Check the compressor's connection and wiring.
●
Check the operation of the expansion valve (fluid return flow).
●
Check the refrigerant filling capacity, and check for leaks.
●
Check the power transistor.
●
Check the outer inverter conductor plate.
●
Check whether the current flow LED flashes at regular intervals.
●
Check whether the correct replacement part has been installed.
●
Check whether the outer main conductor plate is receiving a
power supply.
●
Check whether the power supply meets the regulations. Check
for frequency fluctuations.
Code
Malfunction /
error message
Component/
Designation
Causes and possible fault elimination
Display Internal