Daikin EKOMB22AAV1H Installation Instructions Manual page 49

9.3.4 The power is reduced
Possible causes:
At a high level of rpm, the power has decreased
by more than 5%.
9.3.5 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.
9.3.6 No domestic hot water
Possible causes:
The service display shows nothing.
No 
The service display shows nothing.
No 
Flow sensor does not work.
No 
Tap flow < 1,5 l/min.
No 
No electricity supply on flow sensor (5V DC).
No 
S3 faulty.
No 
The thermostatic shower or bath tap is faulty.
9.3.7 DHW is not reaching the correct temperature
Possible causes:
Tap flow too high.
No 
CH becomes hot during tapping.
DHW temperature set too low.
No 
Daikin Europe NV
Solution:
Check the unit, siphon and output system for contamination.
Yes 
Clean unit, siphon and output system.
Solution:
Yes  Fill up the installation.
Yes  Check the setting and adjust if required.
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:
Yes  Check whether the plug is in the socket.
Yes  Check the fuse, see Electrical diagram par. 10.1
Yes  Replace the flow sensor.
Yes  Increase the tap flow.
Yes  Check the wiring in accordance with the diagram.
Yes  Replace S3.
The thermostatic tap only lets through cold water. This means the tap flow through
Yes 
the boiler remains under 1,5. l/min. Check the thermostatic tap.
Solution/cause:
Reduce the tap flow. Check the dosing disk (EKOMB22AAV1H and
Yes 
EKOMB28AAV1H)
Unwanted circulation in the CH circuit due to thermosiphon effect or second pump in
Yes  the CH circuit. Install a check valve in case of thermosiphon effect or a two-way
valve in case of a second pump.
Yes  Increase the DHW temperature, see par. 7.1.
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