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Boiler cuts out when running hot water
Whenever we run the hot tap for more than a minute the boiler cuts out and the hot water goes cold. It restarts fine but then does it again. What's causing this?
Expert Trade Answers
"There could be a couple of reasons for this, in my experience and the most common fault, this would be a blocked plate heat exchanger. The boiler is cutting out because it can’t move the hot water through the boiler fast enough and is overheating."
Answered on 2nd Jun 2026 - Member since May 2026 -
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"Hi Abdul. This is most commonly an overheating issue, and the boiler is cutting out to prevent further damage. This could be a blockage, or water supply issue i.e. a faulty pump."
Answered on 2nd Jun 2026 - Member since Apr 2018 -
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"It’s mainly plate heat exchanger that causes this problem but in other cases it can be diverter valve."
Answered on 2nd Jun 2026 - Member since Jul 2024 -
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