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Blower fan will not come on when set on Auto in heat mode.

Old Rudd unit works fine but when I cleaned up for the winter heater find the fan will not come on when set on auto. The burner unit fires up but after burning for short period goes out when time for blower fan to come on. Works ok when fan set for ON. Works fine when in AC mode.

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The fan is controlled by a fan center or a stack switch. as burners light and heat up the spring sensor on the bulkhead above burners heats up and turns and a a point energizes the indoor fan if it gets to hot the burners go out on safty. sounds like a fan control is bad tap on them gently and they sometimes break loose but if not then have a pro replace fan control and test heat exchanger.

Posted on Oct 24, 2008

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Hello

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Just a little question, guys!


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