48
No electrical supply (24 V).
Yes
Æ
Replace the faulty controller. Check the wiring in accordance with the diagram.
Check the connector X4.
Replace the faulty controller.
8.3.4
The power is reduced
Possible causes:
Solution:
At high rpm, the power has decreased.
Yes
Æ
Clean the unit and siphon.
Check the flue tube and the air supply system.
8.3.5
CH is not reaching correct temperature
Possible causes:
Solution:
Water pressure in installation is too low.
Yes
Æ
Top up the installation. See par. 6.1.1.
No
È
Room thermostat is not set correctly.
Yes
Æ
Check the setting and adjust if required.
No
È
Temperature is set too low.
Yes
Æ
Increase the CH temperature See Operation CH. If there is an outdoor sensor:
Check the outdoor sensor for short circuit: rectify this.
No
È
No flow through the installation.
Yes
Æ
Check the
Δ
T (± 20° C) between the supply and return CH. Ensure there is good
flow through the installation.
No
È
The boiler power is not set correctly.
Yes
Æ
Adjust the boiler power. See Setting maximum CH power.
No
È
No heat transfer due to contamination in the CH
boiler/installation.
Yes
Æ
Rinse the CH boiler/installation on the side of the CH.
8.3.6
No domestic hot water
Possible causes:
Solution:
The service display shows nothing.
Yes
Æ
Check whether the plug is in the socket.
No
È
The service display shows nothing.
Yes
Æ
Check the fuse, see Electrical diagram par. 10.1
No
È
Flow sensor does not work.
Yes
Æ
Replace the flow sensor.
No
È
Tap flow < 1.5 l/min.
Yes
Æ
Increase the tap flow.
No
È
No electricity supply on flow sensor (5V DC).
Yes
Æ
Check the wiring in accordance with the diagram.
No
È
S3 faulty.
Yes
Æ
Replace S3.
No
È
The thermostatic shower or bath tap is faulty.
Yes
Æ
The thermostatic tap only lets through cold water. This means the tap flow through
the boiler remains under 1.5 l/min. Check the thermostatic tap.
8.3.7
DHW is not reaching the correct temperature
Possible causes:
Solution:
Tap flow too high.
Yes
Æ
Reduce the tap flow. Check the dosing disk (RKOMBG22AAV1 and
RKOMBG28AAV1)
No
È
DHW temperature set too low.
Yes
Æ
Increase the DHW temperature, see par. 7.1.
CH installation becomes hot during tapping.
Yes
Æ
Unwanted circulation in the ch circuit during hot water request due to thermosiphon
effect or second pump in the CH circuit. Install a check valve in case of
thermosiphon effect or a two-way valve in case of a second pump.
No
È
Insufficient heat transfer due to lime scale or
contamination in the CH boiler on the tap water
Yes
Æ
Remove lime scale or rinse the CH boiler on the tap water side.
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