Need help with central air/heat system


Old 03-06-05, 04:51 PM
Visiting Guest
Posts: n/a
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
Old 03-07-05, 11:15 AM
Ed Imeduc's Avatar
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,386
Received 0 Votes on 0 Posts

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
Visiting Guest
Posts: n/a
Thumbs up

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
Join Date: Nov 2002
Location: Massachusetts
Posts: 1,837
Received 1 Vote on 1 Post
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.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: