3
Failures / Errors
GB012 - 25K
10
6.
Electronic card is defect.
B
Switch off the appliance.
B
Cut mains supply.
B
Change the electronic card.
B
Connect to main supply.
B
Switch on the appliance.
B
END
1) If the air inside not removed/discharged, can be also used the manuel air vent valve in recuparator.
4C
is flashing.
Overheat lock-out by temperatur limiters (2 x STB : Flue gas + prim. Heatexchanger). In this case ; Heat
demands is blocked and pump stops 3 minutes later.
Control Step
Action
