my boiler was off for the summer, like totally turned off. Of course it failed with error 89, "primary circuit pump blocked". Technicians suggest keeping the boiler on all the time, even when heating is turned off, so that water pump is able to spin periodically or smth. Is this regarded as warranty situation by Viessmann or not? the idea of not be able to keep the boiler turned off for summer pisses me off.
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