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Heat exchanger overheating boiler locking out no ch or dhw?

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Hi,
There is probably a sensor that in bad or the brain went wacky...but to really help you I need to have a make and model of your boiler...from the code it sounds like a Weil McClain Ultra but others could have the same coding...
Did you try to reset it??? Is a pump bad???
This may take a hands on look to find the exact cause...

heatman101

Posted on Aug 25, 2010

  • killayjack Aug 27, 2010

    Worcester Geenstar 28i junior condensing combi boiler, it will fire up,after 10-15 seconds shutdown heat exchanger too hot to touch. No ch or DHW?

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Posted on Jan 02, 2017

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