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Fan does not come on but I can hear the furnace come on.

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Gas does not ignite on furnace. Fan stays on even when shut off at thermostat. When trying to start, I hear a click and get a gas odor that stops quickly. Furnace had major overhaul 10 years ago.

You have a ignitor problem .Replace the ignitor .Is it a direct spark or a glow type .My guess it's a glow type .About the fan issue sometimes fan would stay running for maybe a minute even after you turn the fan mode ofg

May 27, 2017 | Heating & Cooling

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My thermostat will start the furnace, but the fan will not work.

If it's an older forced air unit furnace, it's likely the inducer motor has malfunctioned. They usually make a lot of noise before they fail, but occasionally they just stop working without warning.

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Dry house with furnace mounted humdifier

Is the furnace fan set on auto or on. You will get better humidity if you keep the fan on. It won't add much to your electric bill because many of the newer furnaces operate the fan on DC voltage. Try it!

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I have a new home 1 yr and when the furnace kicks in, I am assuming the fan it makes a noise but as soon as the heat starts the noise is gone, could this be the furnace blower

Check by turning the unit off and turn the fan to on. Do you hear the noise now? The noise your hearing could be coming from your combustion fan assembly instead. Newer furnaces have a in-shot burner and are nosier than the old style of heater.

Jan 04, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

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Can hear furnace on but fan will not engage. I

This is probably the fan limit that is bad. It should be a black bow tie looking thing next to or near the blower.

Dec 09, 2009 | Coleman Propane Forced Air Heater...

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Fan comes on but unit does not heat or cool the air

You,ll need to open the furnace and observe the led lights on the comtrol board the is a chart attaced to cover. If it is in lock out mode the fan runs. To reset turn off at tstat.the turn the power on at the furnace, set tsat up, observe furnace. First you should hear a small fan then the glow of the ignitor then the opening of the gas valve and flames 10-30 seconds then the big fan.

Mar 27, 2009 | Ruud Central System Air Conditioner

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Sometimes the furnace doesn't come on when it should

OK so its an all electric furnace no gas? I cant think of anything clicking on an electric furnace except the sequencers or the safety switches.

If this is whats your hearing then the fan should definitely be running.

Feel carefully around the fan motor (I assume this is in a mobile home). See if you detect any heat coming around the blower area close to the fan motor. If so the fan motor may be at fault or one sequencer may be out (the main one of course...) the thing is can you get the fan to come on by turning the auto switch on the thermostat (or if older model the Auto On switch on the furnace) to ON? If so you can "limp by and have heat til someone either checks it or you can go on deeper into it. but to go deeper you'll have to let me know you know where the elements are and that you have a volt meter. and feel comfortable using it especially on HOT wires.

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1 Answer

Looks like my humidistat calls for coil fan and for furnace heat

It sounds like the humidifier may be improperly wired.
It's hard to solve without checking the wiring, but it seems like the humidistat is wired so that as the dial is advanced, it incorrectly turns on the fan, or furnace, or both.  The contacts of the humidistat should be wired so that they turn on the solenoid only.  Also, the power to the humidistat, to turn on the solenoid, should come on only when the fan is on.
Hope this helps!

Jan 03, 2009 | Aprilaire 550 Humidifier

1 Answer

BDP furnace + model 585A030080YACR

Sounds like your indoor fan motor is not working, check either the cap or the indoor fan motor it's self.

Jun 26, 2008 | Carrier Heating & Cooling

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