Combi boiler not producing enough hot water

Question

I have a Gloworm flexicom 30 cx combi boiler and when you run a hot tap or shower it only produces hot water for a minute or 2 then runs cold . Sometimes it error codes F25 .
My local heating company have changed the boiler  pump and the plate heat exchanger which have made no difference .
I thought the pump in a combi boiler was only for the Heating (the heating works fine ) and not the hot water ?
can anyone confirm this please ?

thanks in advance

Richard

Owain · Answer

I'd suspect the NTC (negative temp coefficient) thermistors as being faulty or not in good thermal contact with whatever they're supposef to be in contact with. That's a known cause of F25, and most other causes would indeed be related to heating circulation. However circulation problems / pressure / air in the system could still cause this problem even on hot water.

Answered by Owain on February 8, 2021

Combi boiler not producing enough hot water

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