Faults And Possible Remedy Steps - Buderus Logamax GB062-24 KDE H V2 Service Manual

4.3

Faults and possible remedy steps

CL
Hot water temperature sensor (DHW-NTC) is faulty.
Step
1. Check the hot water temperature sensor for
breaks or short CLcircuits.
B Switch off the boiler.
B Remove the Socket of NTC.
B Measure the electrical resistance of DHW-
NTC (in Ω) (see NTC tables).
Is the resistance value correct ?
B Switch off the boiler.
2.
B Cut the main voltage supply.
B Check the soft code via Service function
E.1.
Is the code correct ?
3. Check the cables for damages.
B Switch off the boiler.
B In case of DHW-NTC is changed :
- Remove the NTC socket.
- Measure the NTC resistance.
- Connect the socket again.
B Remove the big socket (20 Pole) on PCB.
B Measure the NTC resistance (Ω) on big
socket (PCB side).
Are measured resistance values on NTC
and socket side different ?
4. Electronic board (PCB) is defect.
Logamax PLus GB062
Remedy
yes: --> 2.
B Change the Sensor.
no:
B Switch on the boiler.
CL on display ?
-->2.
B Switch on the boiler.
yes
CL on display ?
-->3.
no: B Correct the right boiler type co5Lde.
CL on display ?
-->3.
B Change the cable haarness.
yes:
B Switch on the boiler.
CL on display ?
-->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
17