I have a boiler for DHW and CH with no tank (its a Halstead Finest
Gold), that we've been having recurring problems with.

It appears to have problems modulating the water temperature and/or
detecting water flow.

Its in the kitchen, and when the hot water tap in the kitchen is run, we
get water just fine, correct temperature etc. Burner comes on when DHW
tap is on.

However, upstairs in the bathroom, this morning the temperature was
"luke-warm", and totally freezing (straight mains cold, with no heating
at all it seemed), despite the boiler being on, and the burner being on.

A "plumber" came round and changed some part relating to the pressure,
but that doesn't appear to have made much difference. It appears to be
better at detecting DHW demand at the shower etc, but no change to the
temperature fluctuations.

Anything that I can look at that might be the cause?

Thanks for any replies....


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