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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Got a problem this morning with gas heter blower will not

Customer Question

Got a problem this morning with gas heter blower will not come on
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: This problem, this morning blower works in on position and a/c
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: Ummmm it's a propane unit, and has up until last or this morning been operating normally.
JA: Did you double-check the thermostat? And what about the unit's filters?
Customer: Yes checked thermostat and changed batteries in it. repaced filters about one month ago.
Submitted: 10 months ago.
Category: HVAC
Expert:  airheatman replied 10 months ago.

If blower works in ac mode and fan on mode but not in heat mode, the issue is going to be the relay which energizes blower on low speed is sticking open and not closing.Many of these relays are integrated into board and if yours is, you will have to replace the board.

If you can provide model number n furnace I can tell you if relay can be replaced idependantly or not and if you have a volt meter we can verify.

Customer: replied 10 months ago.
Don't know model number, however relay is a plug in 24 volt 6 lug relay. I had been having problems with it sticking in a/c mode and not turning fan or compressor off. Would run continuously until I unplugged relay.
Expert:  airheatman replied 10 months ago.

Model should be on a label just above burners on inside panel.