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As an update, I borrowed a multimeter and tested the values as per the troubleshooter section of the manual and everything checked out. swapped the thermistors anyway - no change. However, I set the hot water temperature control knob to approx two thirds and, hey presto, constant water temp ...

Anybody ?

1 - Flushed it through. TBH it didn't look dirty at all. Flushed virtually nothing out but a few black bits and water seems to flow through easily ? 2 - Haven't got a clue about the temp difference I'm afraid and haven't the means to test it. Cheers

Hi I am currently having problems with my Halstead Ace High Combi boiler after 5 yrs of faultless service. It started with intermittent DHW, which was cured by the replacement of the DHW diaphragm. Now the DHW kicks in but after a short while the burner light goes off and the water...