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Pilot on, gas fires up, no fan comes on.

Vulcan quasar 40 gas heater.
pilot on.
gas fires up and gets hot.
but fan does not work at all.

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Sounds like you are talking about the indoor fan that circulates air through house. Turn the unit off and make sure the fan rotates freely. Next check the capacitor for the fan. If it looks swollen its probably bad. If it doesn't look swollen then you will need a multimeter to check it with. If that's ok then check the fan relay. Let me know what you find.

Posted on May 30, 2010

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Posted on Jan 02, 2017

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