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Heater will not stay lite - Mr. Heater (F274825)

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It can either be your pilot orifice is dirty and not sufficiently heating the thermocouple or your thermocouple is defective and needs to be replaced. Is your pilot flame yellow or blue? It should be a strong blue flame impinging directly on the thermocouple. If it's not, shut it down, take a can of compressed air and blow out the dust, spider web or whatever is inside the pilot assembly where the pilot flame is. Then try relighting it and see if that improves the flame and keeps it lit. Otherwise, just replace the thermocouple. Douglas

Posted on Sep 30, 2010

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Posted on Jan 02, 2017

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