Daikin Altherma EVLQ05+08CA Installer's Reference Manual page 218

13 | Troubleshooting
Error codes of the gas boiler
Installer reference guide
218
Error code Detailed error code Description
L3 00
L4 00
L5 00
P4 00
U0 00
U2 00
U7 00
UA 00
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
OU: Electrical box
temperature
rise problem.
Please contact your dealer.
OU: Malfunction of inverter
radiating fin temperature
rise.
Please contact your dealer.
OU: Inverter instantaneous
overcurrent (DC).
Please contact your dealer.
OU: Malfunction of radiating
fin temperature sensor.
Please contact your dealer.
OU: Shortage of refrigerant.
Please contact your dealer.
OU: Defect of power supply
voltage.
Please contact your dealer.
OU: Transmission malfunction
between main CPU- INV CPU.
Please contact your dealer.
OU: Indoor/outdoor
combination
problem.
Power reset required.
button.
Possible solution
▪ Check wiring
▪ Replace S1
EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10