Buderus Logamax GB062-24 KDE H V2 Service Manual page 34

4
Fault finding
6A
Flame not detected.
Step
18. Fresh air flow rate is too low ?
B Switch the boiler to max operating
19.
mode via service function 2.F3.
B Measure the actuating pressure for
the maintenance necessity (Steuer-
druck) (see capital in IM for the main-
tenace pressure).
Is the actuating pressure (Steuer-
druck) in heat exchanger (WB6)
correct ?
20. Electronic board (PCB) is defect.
34
Remedy
B Check the flue gas system for lengths, elbows
yes:
quantity, extension pipe and other accessories. If
needed, correct/change it.
B Check the air vents in case of B type installation
(fresh air from room).
6A ? --> 19.
no:
6A ? --> 19.
B Switch off the boiler.
yes:
B Clean the main heatblock (WB6).
B Switch on the boiler.
6A ? --> 20.
no: 6A ? --> 20.
B Switch off the boiler.
B Change the electronic board (PCB)
B Switch on the main voltage supply.
B Switch on the boiler.
B END.
Logamax Plus GB062