B
Bev GG
An engineer attended a boiler in my mothers house yesterday and he tried to convince me that turning off the boiler and turning it back on again was likely to blow the PCB. He also claimed that sometimes heating the relays on the PCB would make it work again. I spent 20 years as a field service engineer working on washing machines, dishwashers, tumble dryers and cookers and have never had a PCB blow after turning a machine off and back on again. I am also experienced with electronics and find it impossible to believe that heating up relays can make a PCB work again. In fact what the engineer was heating was the power module on the PCB, not a relay. By the way it is a Viessmann W100 WB1B system boiler.