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Pilot lite does not lit please advise what to do.the burner stays on if lit directly with open flame.is this dangerous.

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What you describe is typically caused by a faulty thermocouple. The thermocouple senses the heat from the pilot light and TURNS OFF the pilot when it no longer senses the heat.
When the thermocouple turns off the pilot, it's not necessarily dangerous, but the water heater won't turn on without help.

Posted on Mar 23, 2011

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Open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Pilot-outage-troubleshooting.pdf
http://waterheatertimer.org/pdf/Vent-spillage-test-atmospheric-gas-water-heater.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

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