Table of Contents
Code
Malfunction /
error message
Display Internal
E9041
U4
E9042
U5
Transmission fault Electrical components
E9043
U7
E9044
UA
heating time (hot
E9045
AJ
water)
compressor start-
E9046
E6
up
E9047
E8
overvoltage
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
8
Component/
Designation
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.
Communication between printed circuit board A1P (outdoor unit)
and RoCon BM2C disturbed.
● See fault code E200.
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.
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.
WW heating > 6 hours
● Check the heating element.
● Check whether the power supply meets the regulations. Check
Software
● 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
System detects an abnormal electricity wave shape 16 times in
5 min
● Check whether the power supply meets the regulations. Check
● Check the compressor.
Software
● 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
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.
Software
● 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
● Check whether the power supply meets the regulations. Check
x
Errors, malfunctions and messages
Causes and possible fault elimination
● Check, replace.
● Check, eliminate cause, replace.
for frequency fluctuations.
circuit board match.
for frequency fluctuations.
when the compressor is not in operation: check the expansion
valve.
power supply.
for frequency fluctuations.
Installation and maintenance instructions
55
Table of Contents
