Buderus Logamax GB062-24 KDE H V2 Service Manual page 19

CP
System boiler: Cylinder / tank temperature sensor.
Step
1. Check the tank temperature sensor for
breaks or short circuits.
B Switch off the boiler.
B Remove the NTC of terminal.
B Measure the electrical resistance of Tank-
NTC (in Ω) (see NTC tables).
Is the resistance value correct ?
2. B Switch off the boiler.
B Cut the main voltage supply.
B Check the soft code and boiler type via
Service function E.1 and 4.E.
Is it correct ?
3. Check the NTC cables.
B Is there any damages or short circuit or
break ?
4. Electronic board (PCB) is defect.
Logamax PLus GB062
Remedy
yes: --> 2.
B Change the Sensor (NTC).
no:
B Switch on the boiler.
CP on display ?
-->2.
yes B Switch on the boiler.
CP on display ?
-->3.
B Correct the right boiler type code.
no:
CP on display ?
-->3.
B Change the cable/NTC.
yes:
B Switch on the boiler.
CP 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
19