Buderus Logamax GB062-24 KDE H V2 Service Manual page 21

3C
Fan doesn't reach to start fan speed.
Step
1. Are the both fan cable (power and PMW
signal) correct connected ?
2. Is fan cable wrong ?
B Switch off the boiler.
B Cut the main voltage supply.
B Check the fan connection cable.
Is there open circuit ?
3. Is fan defect ?
4. Electronic board (PCB) is defect.
Logamax PLus GB062
Remedy
yes: --> 2.
B Switch off the boiler.
no:
B Connect the cables again.
B Switch on the boiler.
3C ? -->2.
B Chang the fan cable.
yes:
B Switch on the main voltage supply.
B Switch on the boiler.
3C ? -->3.
no: -->3.
yes: B Switch off the boiler.
B Cut the main voltage supply.
B Change the fan.
B Switch on the main voltage supply.
B Switch on the boiler.
3C ? --> 4.
no: --> 4.
B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4
Fault finding
21