Had an isar he 35, pump over run on intermittent after heating is off, and it calls c... I've had it were its d and that's leaking tap/pipe, it's had new pcb and programmable room stat changed, I get there it's ok so obviously can't fault find, anyone else had same problem?
It should have some overrun to cool the internals after it has done its job The Isar does have a preheat function and will often do a quick light every now and again to stop the internals seizing up
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