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flash013 10-27-2013 11:10 AM

furnace will not fire
I have a RHEEM RGDG- 100 AUER gas furnace that will not fire, the pilot was out and I started that but nothing else happens just a humming noise...Its getting cold help

mlijoi 10-27-2013 11:25 AM

Is your themostat calling for heat (is your furnace getting the signal)?

flash013 10-27-2013 11:34 AM

I changed the batteries in the themostat and it says heat on, also the furnace is making a humming noise

FClef 10-27-2013 11:48 AM

Can you determine where the humming is coming from? Is it a motor, a transformer, the gas valve, or a control?

Pictures may help.

yuri 10-27-2013 12:05 PM

post 2 pics of it with both doors off so we can see which exact model U have.

flash013 10-27-2013 01:10 PM

3 Attachment(s)

yuri 10-27-2013 02:19 PM

Press the door switch in and put duct tape on it to keep it closed. Check for 24 volts between W and C on the circuit board. The humming is the transformer and OK. If no 24 volts check between R and C. If no volts then a fuse is blown. First thing that should happen is the exhaust fan starts. If no volts between W and C then the thermostat may be bad ( if you have 24 volts between R and C).

ben's plumbing 10-27-2013 02:32 PM

that is a criterian furnace with a standing pilot.... clean pilot and replace thermocupler and make sure its fully engulfed in the pilot....ben sr

flash013 10-27-2013 03:40 PM

I read 27 volts

yuri 10-27-2013 03:48 PM

where? If you have 27 volts between W and C then the exhaust fan should run. If not it is seized up or the circuit board is bad.

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