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

4
Fault finding
8Y
External switching contact triggered.
Step
1. B Switch off the boiler.
Is the bridge in connection terminal
installed ?
B Switch off the boiler.
2.
B Cut the main voltage supply.
Is external temperature limiter (e.g.
TB1) connected ?
B Check the external temperature lim-
3.
iter measure the circuit.
Is the circuit open?
B Switch off the boiler.
4.
B Cut the main voltage supply.
B Check the connection cable.
Is there a brake or open circuit in
connection cable ?
24
Remedy
yes: --> 2.
B Install the bridge in
no:
B Switch on the boiler.
8Y ? --> 2.
yes: --> 3.
no: 8Y ? --> 6.
B Check the connection at limiter and fasten the screws
yes:
very well.
B Switch on the main voltage supply.
B Switch on the boiler.
8Y ? --> 4.
no: --> 4.
B Repair or change the connection cable.
yes:
B Switch on the main voltage supply.
B Switch on the boiler.
8Y ? --> 5.
B Connect the cable again.
no:
B Switch on the main voltage supply.
B Switch on the boiler.
--> 5.
Logamax Plus GB062