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Going to take previous advice that i may require a flowswitch for my Biasi 24s, as it does not always give hot water on demand. Anyone got any other suggestions? Would be eternaly grateful for any help.

In that case I will take your advise and hang fire for a few more days. Thanks again

Thank you for your help. Its a starting point. Next step source part!

When its working fine, the heating pipes do not get hot. Just the pipe going to the tap.

Yes, when it calls for hot water the water coming from the tap remains cold, so turning off the tap and calling for CH, the boiler fires up, we then open the tap which then does provide hot water and continues to do so when we turn the CH back off, keeping the tap running when we do. This fault...

Basically we have had no bother with our Biasi 24s combi boiler for the previous 4yrs, up until a few months ago. Occasionally the boiler would not fire up when the HW tap was turned on, but could turn the CH on and the boiler would fire up instantly therefore giving us HW! This was happening...