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Apologies - I'm having a bit of difficulty here - could the "no flame detected" and high flow rate - but low water temperature - be related to a heat exchanger not working efficiently? As in, it has significant water scaling? Is there a way to check this? The delta equation was handy. I'm...

Hullo, for the 80 DHW Gross is (kW) 28.7, in BTU/h 98000. At this precise moment the boiler is showing the same error as before, "No flame detected". The plumber today checked my gas input and declared it perfectly healthy! Should I be calling the supplier to check warranty?

For two years I've had a shower over my bath that had a very high flow rate and always produced hot water. During the recent snows my boiler, for the first time returned an error of two flashing red lights, an error indicating "no flame detection". I let the boiler cool down and reset it...