12 Troubleshooting
Installer reference guide
80
EPGA11~16DAV3 + EABH/X16DA6V+9W
Daikin Altherma – Low temperature split
4P556069-1 – 2018.10
12.4 Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
measures before resetting an error code. This should be done by a
licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
12.4.1 To display the help text in case of a
malfunction
In case of a malfunction, the following will appear on the home
screen depending on the severity:
▪ : Error
▪ : Malfunction
You can get a short and a long description of the malfunction as
follows:
1 Press the left dial to open the main menu and go to
Malfunctioning.
Result: A short description of the error and the error
code is displayed on the screen.
2 Press in the error screen.
Result: A long description of the error is displayed
on the screen.
12.4.2 Error codes: Overview
Error codes of the unit
Error code Detailed error
code
Description
7H 01 Water flow problem
7H 04 Water flow problem during
domestic hot water production
7H 05 Water flow problem during
heating/sampling
7H 06 Water flow problem during
cooling/defrost
7H 07 Water flow problem. Pump
deblocking active
80 01 Entering water thermistor
abnormality of outdoor unit
81 00 Leaving water temperature
sensor problem
81 04 Leaving water temperature
sensor not properly mounted
81 06 Entering water temperature
thermistor abnormality (indoor
unit)
89 01 Heat exchanger frozen
89 02 Heat exchanger frozen
89 03 Heat exchanger frozen
8F 00 Abnormal increase outlet water
temperature (DHW)
8H 00 Abnormal increase outlet water
temperature
8H 03 Overheating water circuit
(thermostat)
Error code Detailed error
code
Description
A1 00 Zero cross detection problem
A5 00 OU: High pressure peak cut /
freeze protection problem
AA 01 Backup heater overheated
AA 02 External backup heater
overheated
AC 00 Booster heater overheated
AH 00 Tank disinfection function not
completed correctly
AJ 03 Too long DHW heat-up time
required
C0 00 Flow sensor malfunction
C0 01 Flow switch malfunction
C0 02 Flow switch malfunction
C4 00 Heat exchanger temperature
sensor problem
C5 00 Boiler communication error
CJ 02 Room temperature sensor
problem
E1 00 OU: PCB defect
E2 00 Leakage current detection error
E3 00 OU: Actuation of high pressure
switch (HPS)
E4 00 Abnormal suction pressure
E5 00 OU: Overheat of inverter
compressor motor
E6 00 OU: Compressor startup defect
E7 00 OU: Malfunction of outdoor unit
fan motor
E7 62 Brine flow abnormality
E8 00 OU: Power input overvoltage
E9 00 Malfunction of electronic
expansion valve
EA 00 OU: Cool/heat switchover
problem
EC 00 Abnormal increase tank
temperature
EC 04 Tank preheating
F3 00 OU: Malfunction of discharge
pipe temperature
F6 00 OU: Abnormal high pressure in
cooling
FA 00 OU: Abnormal high pressure,
actuation of HPS
H0 00 OU: Voltage/current sensor
problem
H0 01 Brine flow switch malfunction
H1 00 External temperature sensor
problem
H3 00 OU: Malfunction of high pressure
switch (HPS)
H4 00 Malfunction of low pressure
switch
H5 00 Malfunction of compressor
overload protection
H6 00 OU: Malfunction of position
detection sensor
H8 00 OU: Malfunction of compressor
input (CT) system
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