Need help with central air/heat system


Old 03-06-05, 04:51 PM
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Need help with central air/heat system

Could use some advice... Have central air/forced hot air. It is in the heat position.
When wall switch is on auto and thermostat is calling, the flame kicks on but the fan only makes humming noise. When switched to the on position- fan works properly. Thanks
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Old 03-07-05, 11:15 AM
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Check the blower motor for low speed it can be out. Also the fan relay or control for fan on with heat. look at the wire schematic for the control that turns the fan on on heat

Old 03-07-05, 06:45 PM
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saw a similar problem in the forum and pulled out the capacitor-had it tested -it was no good.
Old 03-23-05, 07:23 PM
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capacitor problem?

If the capacitor was bad, it wouldn't run in either position,... check you fan relay switch. It is operated by either time like a sequenser or a heating probe.

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