ACV International
48
8.2.5
The power is reduced
Possible causes:
Solution:
At high rpm the power has fallen by more than
5%.
Yes
Check appliance and flue system for fouling.
Clean the appliance and flue system.
8.2.6
CH does not reach temperature
Possible causes:
Solution:
Room thermostat setting incorrect.
Yes
Check the settting and if necessary adjust: Set to 0.1A.
No
Temperature is too low.
Yes
Increase the CH temperature. See Operating CH . Check esternal sensor for short-
circuiting. Rectify.
No
Pump not running correctly. Pump setting is too
low.
Yes
Increase pump setting, or replace the pump.
No
No circulation in the installation.
Yes
Check whether there is circulation: at least 2 or 3 radiators must be open
No
The boiler power has not been correctly set for
the installation.
Yes
Adjust the power. See setting maximum CH power.
No
No heat transfer as a result of lime scale or
fouling in the heat exchanger.
Yes
Descale or flush the heat exchanger on the CH side.
8.2.7
No hot water (only in combination with external DHW tank)
Possible causes:
Solution:
No current at the divider valve (230V AC).
Yes
Check the wiring against the diagram.
No
Divider valve not functioning
Yes Replace divider valve
No
No current on the boiler sensor/thermostat
(5 V DC)
Yes
Check the wiring against the diagram.
.
No
Burner does not ignite for DHW demand
because of defect boiler sensor.
Yes Replace boiler sensor.
No
Burner does not ignite
Yes See burner does not ignite.
8.2.8
Hot water does not reach temperature
Possible causes:
Solution:
Temperature setting to low
Yes
Adjust the temperature setting. See & 7.1
