8.5 Reduced output
Possible causes Remedies
8.6 CH does not reach the correct temperature
Table 6. NTC resistances
NTC 12 kOhm
T [°C] R[ohm] T [°C] R[ohm] T [°C] R[ohm]
-15 76020 25 12000 65 2752
-10 58880 30 9805 70 2337
-5 45950 35 8055 75 1994
0 36130 40 6653 80 1707
5 28600 45 5522 85 1467
10 22800 50 4609 90 1266
15 18300 55 3863 95 1096
20 14770 60 3253 100 952
1. Check appliance and flue system At high speed, the power has decreased
Yes
by not more than 5%. for pollution.
2. Clean appliance and flue system.
Possible causes
1. Check the setting and adjust if Room thermostat settings not correct.
Yes
necessary: set to 0.1 A.
No
1. Raise the pump setting or replace
the pump.
1. Check for circulation: at least 2 or 3
radiators must be open.
1. Adjust the power,
see Setting maximum CH power.
1. Descale or flush the heat exchanger
on the CH side.
No heat transfer due to scaling or pollution
in the heat exchanger.
Yes
The boiler power is not set well
for the system.
Yes
No
No
No circulation in the system.
Yes
Pump does not run well.
Pump setting too low.
Yes
No
No
1. Raise the CH temperature, Temperature set too low.
see CH operation.
Yes
2. Check the outside sensor for
short circuit: remedy this..
Remedies
45
