ROTEX Heating Systems GmbH
47
8.3.4
The power is reduced
Possible causes:
Solution:
At a high level of rpm, the power has decreased
by more than 5%.
Yes
Check the unit
,
siphon and output system for contamination.
Clean unit, siphon and output system.
8.3.5
CH is not reaching correct temperature
Possible causes:
Solution:
Water pressure in installation is too low
Yes
Fill up the installation.
No
Setting of room thermostat is not correct.
Yes
Check the setting and adjust if required: Set to 0.1 A.
No
Temperature is set too low.
Yes
Increase the CH temperature. See Operation CH. If there is an outdoor sensor:
Check the outdoor sensor for short circuit: rectify this.
No
Pump does not run properly. Pump setting is
too low.
Yes
Increase the pump setting or replace the pump.
No
No flow through the installation.
Yes
Check whether there is a flow through the installation: at least 2 or 3 radiators must
be open.
No
The boiler power is not set for the installation.
Yes
Adjust the power. See Setting maximum CH power.
No
No heat transfer due to contamination in the
exchanger/installation.
Yes
Rinse the exchanger/installation on the side of the CH.
8.3.6
No hot water (only applicable in indirectly fired tank)
Possible causes:
Solution:
The service display shows a hyphen (
-
).
The unit is off.
Yes
Switch on the unit with the button.
No
No electricity supply on the three-way valve.
Yes
Check the wiring in accordance with the diagram.
No
Three-way valve does not switch.
Yes
Replace three-way valve.
No
No electricity supply on tank sensor/thermostat
(5V DC).
Yes
Check the wiring in accordance with the diagram.
No
Boiler controller does not come in on DHW:
boiler sensor/thermostat faulty.
Yes
Replace the tank sensor/thermostat.
No
Boiler controller does not ignite.
Yes
See boiler controller does not ignite.
8.3.7
DHW does not reach desired temperature (only applicable for indirectly fired tank)
Possible causes:
Solution:
Tank temperature is set too low.
Yes
Set tank temperature. See Setting and adjustment
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.