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I have a combi boiler. It had a few parts replaced after a breakdown 2

Posted by Paul , on
I have a combi boiler. It had a few parts replaced after a breakdown 2years ago. Since then its shutting off if hot water runs for more than 5 mins. Any ideas

chris sanders

it depends what parts were fitted but it sounds like the boiler is over heating, this can be caused by a few things but the most likley cause is the plate heat exchanger is scaled up and not allowing the correct heat transfer. Any good engineer should be able to help.

sevket bektas

I will say that the gas valve modulator should be checked, it might not modulate to the low rate and thus the boiler over heating.

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