Daikin Altherma EJHA04AAV3 Installer's Reference Manual page 92

15 Troubleshooting
Error code Detailed error
code
HC 00
HJ 11
U3 00
U4 00
U5 00
U6 36
U8 01
U8 02
U8 08
UA 00
UA 52
INFORMATION
In case of error code AH and no interruption of the
disinfection function occurred due to domestic hot water
tapping, following actions are recommended:
▪ 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 by 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.
INFORMATION
Error AJ-03 is reset automatically from the moment there is
a normal tank heat-up.
Installer reference guide
92
Description
Tank temperature sensor
problem.
Please contact your dealer.
Boiler abnormality detection
Check boiler
Refer to boiler manual
Under floor heating screed
dryout function not completed
correctly.
Indoor/outdoor unit
communication problem.
User interface
communication problem.
Boiler standby abnormality
Check boiler
Refer to boiler manual
Connection with adapter lost
Please contact your dealer.
Connection with room thermostat
lost
Boiler communication
malfunction
Indoor unit, outdoor unit
matching problem.
Power reset required.
Boiler, indoor unit matching
problem.
Please contact your dealer.
See "15.4.10 Symptom: Boiler/
hydrobox combination
abnormality (UA52 error)" on
page 88
INFORMATION
Error EC-04 is reset automatically from the moment the
domestic hot water tank is preheated to a sufficiently high
temperature.
INFORMATION
If the unit detects flow when the pump is not running, an
external device might be causing flow, or there might be
something wrong with the flow measuring devices (flow
sensor and flow switch).
▪ If the flow sensor detects flow when the pump is not
running, the unit will stop operation and the user
interface will display error C0‑00. For the unit to resume
operation, this error needs to be reset manually.
▪ If the flow switch detects flow when the pump is not
running, the unit will temporarily stop operation and the
user interface will display error C0‑01. After some time,
the error will reset automatically and the unit will
resume operation. If the problem persists, the unit will
stop operation and the user interface will display error
C0‑02. For the unit to resume operation, this error
needs to be reset manually.
Error codes of the gas boiler
The controller on the gas boiler detects faults and indicates them on
the display by error codes.
If the LED is flashing, the controller has detected a problem. Once
the problem is rectified, the controller can be restarted by pressing
the button.
Following table shows a list of error codes and the possible
solutions.
Error Cause Possible solution
code
10, 11, Sensor fault S1 ▪ Check wiring
12, 13,
▪ Replace S1
14
20, 21, Sensor fault S2 ▪ Check wiring
22, 23,
▪ Replace S2
24
0 Sensor fault after Replace S1 and/or S2
self-check
1 Temperature too ▪ Air in installation
high
▪ Pump is NOT running
▪ Insufficient flow in installation
▪ Radiators are closed
▪ Pump setting is too low
2 S1 and S2 ▪ Check cable set
interchanged
▪ Replace S1 and S2
4 No flame signal ▪ Gas tap is closed
▪ No or incorrect ignition gap
▪ Gas supply pressure is too low or
▪ Gas valve or ignition unit is NOT
Daikin Altherma Hybrid hydrosplit heat pump
fails
powered
EJHA04AAV3 + EHY2KOMB28+32AA
4P531180-1 – 2018.06