Daikin Altherma R Hybrid Installer's Reference Manual page 186

13 | Troubleshooting
Error codes of the gas boiler
Installer reference guide
186
Error code Detailed error code Description
7H 04
7H 05
7H 06
INFORMATION
Error AJ-03 is reset automatically from the moment there is a normal tank heat-up.
INFORMATION
Error EC-04 is reset automatically from the moment the domestic hot water tank is
preheated to a sufficiently high temperature.
INFORMATION
If a U6‑36 error occurs, press the gas boiler's On/off button.
INFORMATION
If a U4‑00 error occurs, the indoor unit cannot communicate with the outdoor unit.
When the plate heat exchanger of the indoor unit is freezing, the pump of the indoor
unit will be forced ON to prevent freeze-up.
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
Following table shows a list of error codes and the possible solutions.
Error code Cause
10, 11, 12, Sensor fault S1
13, 14
The water flow problems mainly
occurred during domestic hot water
operation. Check the domestic hot
water circuit.
The water flow problems mainly
occurred during space heating
operation. Check the space heating
circuit.
The water flow problems mainly
occurred during cooling/defrost
operation. Check the space heating/
cooling circuit.
Additionally, this error code might be an
indication of frost damage to the plate
heat exchanger. In that case, contact
your local dealer.
button.
Possible solution
▪ Check wiring
▪ Replace S1
CHYHBH05+08AF + EHYKOMB33A
Daikin Altherma R Hybrid
4P471761-1E – 2020.10