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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 (
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.
ROTEX Heating Systems GmbH
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
-
). 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.
47
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