ROTEX Heating Systems GmbH
51
contamination in the CH boiler on the tap water
side.
8.3.8
CH installation stays warm unwanted
Possible causes:
Solution/cause:
Room thermostat/weather dependent regulation
faulty or short circuited.
Yes
Check the wiring.
Check OpenTherm and On/off connection of the unit.
Replace the thermostat.
Replace the weather-dependent regulation.
No
CH installation is heated due to Tap comfort.
The service display regularly shows code 7.
Yes
Unwanted circulation in the CH circuit 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.
