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Can the furnace work without the fan - Omega Keeprite Furnace Flue Exhaust Venter Blower # Fb RFB350

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Wiring schematic for an old honeywell R8325C1020-8514 fan center relay..


Without a picture Mike, I'm not sure this answer is absolutely correct but.... most of the old fan centers had a multitap transformer so different colored wires were provided to connect to 110v, 208v or 230v. If thats what it is, white was common to the black for 110v. White was common to orange for 208v and white was common to red for 230v.

If you have red and black hanging loose, possibly the center is connected to orange and white with 208v power supply. Of course many times, the orange and red were interchanged with 208v OR 230v.

Another point is that virtually all residential gas furnaces operate on 110v and 208/230v operated electric furnace.

As stated above, without a picture this is just a reasonably educated guess....Conventional furnaces less than 15 years old typically no longer have fan centers.

Nov 29, 2015 | Honeywell Heating & Cooling

1 Answer

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.

Mar 06, 2015 | Honeywell T87N1000 Round Thermostat

1 Answer

Atwood 1522 LP furnace fan operates at one speed only


Furnace only works at one speed, high and low fan is usually used for AC. It never has had 2 speeds on furnace correct? Furnaces usually only have 1 speed, except for some home models.

Mar 14, 2014 | Atwood 38591 Excalibur XT Furnace 1522 15K...

1 Answer

Fan won't blow on ac, but works on furnace


The fans heat speed is low speed and the cool speed is high speed. High speed is controlled by the fan relay normally open switch, the low speed is controlled by the temperature delay or time delay.
see diagram

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Jun 05, 2013 | Coleman Home Electric Furnace Eb15b/Eb15d

1 Answer

I have a Jantitrol GMP 100-3. When it works, an exhaust fan kicks in for a minute, then the flames go on and it starts to heat. Then what started to happen was the exhaust fan would go on for a bit, go...


"There is a significant dust source next to the furnace." You were headed in the right direction without knowing. Dust can certainly play a big role in creating the problem. When the furnace is operating it's sucking in the surrounding dust and lint. This can clog the electrical contacts, cause false readings to the control panel and other damage. If you feel comfortable doing it, you can clean it yourself. Just remember to turn OFF all power to the furnace, before removing the panels and working inside the furnace. A Shop Vac with a hose, brush attachment and crevice tool will be a big help in cleaning. If you don't feel comfortable making it a DIY project, call a qualified technician to perform the work.

Hope this helped you.

Mar 15, 2011 | Heating & Cooling

1 Answer

Goodman GDT070 furnace pressure swich problem.


Inspect both the intake and exhaust pipes for blockage or debris. Inspect the small tubes that go from your combustion fan to the pressure switch and the tube that goes from the fan to the condensate drain. They all should be clean and dry. Inspect the combustion fan to see if it spins without it scraping on the housing or it may be filled with water or debris. Last, check the air filter and clean or replace.

Oct 10, 2009 | Heating & Cooling

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

Heater no longer works on auto fan, only manual fan


When you call for fan in auto ensure your getting 24 volts at pin on control board, if it is not energizing then there is a problem with the relay.. Before you change out the expensive control board, try the therm..

Dec 09, 2008 | Heating & Cooling

2 Answers

Furnace starts, but no heat nor fan operation.


If youe burners fire off it's not the transformer. It suonds like the fan/limit control. Try to turn the fan switch on the thermostat to the on position and see if the fan comes on, if it does leave it on and turn the heat on and see if the heat works that way. If so it would be the combination fan/limit control.

Feb 07, 2008 | Heating & Cooling

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