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jamesvinton

Atwood Furnace In My New HR Ambassador

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Sounds like sail switch may not be closing. That would be the first thing to check. The air movement from the fan blows the sail switch paddle and closes a circuit which then allows the opening of the gas valve and ignition. Often mud wasps or other debris prevent the sail switch from operating properly. Clean the exhaust tube and air intake tube by removing outside cover. Check for movement of sail. Can be prevented by use of screen cover.

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Yes, a non-closing sail switch will allow the fan to come on, but not for the gas valve to open or igniter to work.

But, there are number of reasons for a sail switch to not close in addition to a bad sail switch:

Low voltage is #1-- fan spins too slowly to generate sufficient CFM.

Blockage in either the return or outflow side (say, for example, you closed a couple of vents).

Bad connection at the PC board-- often "cured" by removing the connection and using a good electric cleaner. De-oxit makes some excellent products for this.

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