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Water gets hot then turns cold and runs cold then hot again

Baxi combi 80e

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  • sjtg Feb 17, 2009

    My Baxi 80e seems to have the same fault, When in the shower it runs hot for a while then goes cold, then back to hot again. I've checked the boiler and all seems OK with the lights, but when it goes cold it looks like the flame light goes out as if it's shut off on a high temp cut out.

    Going to open it up and look at the safety thermostat and clean the temp sensor. Not sure what to do after this, any help appreciated.

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Secondary heat exchanger is blocked on sealed system side.
Remove and de-scale heat exchanger or fit new one.

Posted on Jan 14, 2010

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Get a fully trained, corgi registered gas engineer to repair and service the boiler, these boilers are not a do it yourself proposition. Safety stats and temp sensors are not serviceable items, replacement if required after testing is the only option, bye the way if you carry out any work on the boiler yourself, any incident that occurrs due to your work will invalidate your building and contents insurance and you could end up in court for your actions as you are not competent to work on the boiler.

Posted on Mar 04, 2009

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