Viesmann heat only boiler, modern condensing , modulating boiler, turned into service mode and left there.
Controller activated hot water heating up and then ran for a long time in service mode at max - peak power without modulating down at any time. The hot water cylinder is a large one so it will have been running in peak gas flow mode for quite some time.
I'm looking to understand the impact to such a daft mistake, in my view this will have used excessive gas at best and at worst the heat generated by funning the boiler full pelt on such a short circuit like the hot water will have passed extreme heat via the pump, three port valve, cylinder heating coil, heat exchanger, boiler internals. As far as I understand it the boiler should not allowed to run in this mode for any period of time except to conduct peak flow gas checks.
Can anyone give me advice about the likely impact to the system. The heating system is now non functional, but I'm looking to get a broader view about what damage could have been done to all the components of the system by running in this mode.
Thanks very much