Daikin Altherma EHYKOMB33AA - Symptom: the Pressure Relief Valve Opens; Symptom: the Water Pressure Relief Valve Leaks; Symptom: the Space Is NOT Sufficiently Heated at Low Outdoor Temperatures

15 | Troubleshooting
Installer reference guide
218
EVLQ05+08CA + EHYHBH05A + EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
15.3.4 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
The water volume in the installation is
too high
Make sure that the water volume in the
installation is below the maximum
allowed value (see "8.5.3To check the
water volume and flow rate"[4100]
and "8.5.4Changing the pre-pressure of
the expansion vessel"[4102]).
The water circuit head is too high The water circuit head is the difference
in height between the indoor unit and
the highest point of the water circuit. If
the indoor unit is located at the highest
point of the installation, the installation
height is considered 0m. The maximum
water circuit head is 7m.
Check the installation requirements.
15.3.5 Symptom: The water pressure relief valve leaks
Possible causes Corrective action
Dirt is blocking the water pressure relief
valve outlet
Check whether the pressure relief valve
works correctly by turning the red knob
on the valve counterclockwise:
▪ If you do NOT hear a clacking sound,
contact your dealer.
▪ If the water keeps running out of the
unit, close both the water inlet and
outlet shut-off valves first and then
contact your dealer.
15.3.6 Symptom: The space is NOT sufficiently heated at low outdoor temperatures
Possible causes Corrective action
Gas boiler operation is not activated Check and make sure that:
▪ The gas boiler is switched On and is
NOT in standby mode.
▪ The communication cable between
the gas boiler and the indoor unit is
properly mounted.
▪ There is no error code on the gas
boiler display.