Daikin Altherma C Gas W EHOB42ABV1H Instructions D'installation page 46

8.3.4 The power is reduced
Possible causes:
At a high level of rpm, the power has decreased
by more than 5%.
8.3.5 CH is not reaching correct temperature
Possible causes:
Water pressure in installation is too low
No 
Setting of room thermostat is not correct.
No 
Temperature is set too low.
No 
Pump does not run properly. Pump setting is
too low.
No 
No flow through the installation.
No 
The boiler power is not set for the installation.
No 
No heat transfer due to contamination in the
exchanger/installation.
8.3.6 No hot water (only applicable in indirectly fired tank)
Possible causes:
The service display shows a hyphen (
The unit is off.
No 
No electricity supply on the three-way valve.
No 
Three-way valve does not switch.
No 
No electricity supply on tank sensor/thermostat
(5V DC).
No 
Boiler controller does not come in on DHW:
boiler sensor/thermostat faulty.
No 
Boiler controller does not ignite.
8.3.7 DHW does not reach desired temperature (only applicable for indirectly fired tank)
Possible causes:
Tank temperature is set too low.
8.3.8 CH installation stays warm unwanted
Possible causes:
Room thermostat/weather dependent regulation
faulty or short circuited.
Daikin Europe NV
Solution:
Check the unit,
Yes 
Clean unit, siphon and output system.
Solution:
Yes  Fill up the installation.
Yes  Check the setting and adjust if required: Set to 0.1 A.
Increase the CH temperature. See Operation CH. If there is an outdoor sensor:
Yes 
Check the outdoor sensor for short circuit: rectify this.
Yes  Increase the pump setting or replace the pump.
Check whether there is a flow through the installation: at least 2 or 3 radiators must
Yes 
be open.
Yes  Adjust the power. See Setting maximum CH power.
Yes  Rinse the exchanger/installation on the side of the CH.
Solution:
-
Switch on the unit with the
).
Yes 
Yes  Check the wiring in accordance with the diagram.
Yes  Replace three-way valve.
Yes  Check the wiring in accordance with the diagram.
Yes  Replace the tank sensor/thermostat.
Yes  See boiler controller does not ignite.
Solution:
Yes  Set tank temperature. See Setting and adjustment
Solution/cause:
Check the wiring.
Check OpenTherm and On/off connection of the unit.
Yes 
Replace the thermostat.
Replace the weather-dependent regulation.
siphon and output system for contamination.
button.
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