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My boiler comes on and then shut down the plot light up then go out.

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You did not provide any information on the boiler so I cannot provide a lot of help. What ever device senses that the flame is lit is not working. It may only be dirty. You should call a company that services boilers and schedule a service call.

Posted on Nov 30, 2014

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It may be the sensor (cad cell eye) is doing its job, however why is the question. Could be a number of things including the fuel delivery, ignition, improper air adjustment, etc.
No qualified professional should diagnose a problem unless they are in front of the appliance. I recommend you find a licensed qualified heating techician. Hope this helps.

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