Question about Friedrich QuietMaster Electronic SS12J30D Air Conditioner

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Fan working but thermostat is not

Our thermostat stopped working. Can turn on heat or air, but the fan works

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You can judge if your thermostat is working by listening for a click when you rotate the knob.

Posted on Feb 17, 2009

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Posted on Jan 02, 2017

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I have a Rheem Classic Super Quiet 80 gas furnace (for heat). The fan stops when the "heat" turns on.


Any time I ever had trouble,first thing to suspect is the thermostat.
They lose contact sometimes and sometimes you tap the face and they work til next glitch.
If the thermostat has some years on it,go ahead and replace it.
Can't you just leave the heat and fan in auto? That would be best,I think. don-ohio

Jan 10, 2017 | Heating & Cooling

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Intertherm MGHA-070ABFC-05 will not run/cool


Multiple problems. Eliminate thermostat first. Remove face from wall and turn on breaker. If fan still runs you have a bad board or bad relay. If fan outside is running compressor should be too. These operate on same contactor. Verify you are getting 24 volts to coil side of contactor. If odf stops working and contactor remains pulled in you have a bad motor. If odf motor stops working the compressor will shut off due to overheating.

Jun 07, 2016 | Intertherm 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.

Mar 06, 2015 | Honeywell T87N1000 Round Thermostat

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Do I have a wiring or other easy to fix problem or must I replace thermostat? My Totaline 0441 thermostat (installed in 2004) turns fan on as programed but just suddenly stopped producing HEAT.


It is possible that it is the Thermostat but more likely the heat source the thermostat is connected to. Set the thermostat to heat to as high as it can go. If the heat source does not come on in a few minutes you likely have a problem at the heater which may be a simple loose or burnt connection in the wiring or something more serious.

Jan 02, 2015 | Heating & Cooling

1 Answer

Heil epm36f19a1 runs but no heat


Fan relay is stuck among other things. The thermostat turns on the combustion air fan and puts power to the spark unit. If the burner comes on after the temperature in the heat exchanger rises the indoor fan will then come on. After the thermostat comes to temperature the power to the gas valve which shuts off the burner. Then after the heat exchanger cools a bit the indoor fan will stop. That's the sequence of events. look at the switches that control the fans. There is a wiring diagram somewhere on one of the panels that access the unit for service.

Mar 06, 2013 | Electronics - Others

2 Answers

My air handler fan will not come on during heating but will operate during cooling - Anerican Standard unit TWEO65E13FBO


Hi,
Please check the thermostta first. Take the thermostat to the air handler and hook up on a short thermostat leash. The unit should work properly, then its for sure that the problem is going to be in your thermostat wiring. If problem persists then we are troubleshooting a thermostat.

Let us know if you need further assistance.
Thanks for contacting Fixya.com

Jan 12, 2010 | Heating & Cooling

1 Answer

99 saturn no heat or defrost


Sounds like your heater core is mostly stopped up. You need to have your cooling system back flushed and cleaned.

Sep 12, 2009 | 1997 Saturn SL

1 Answer

We do not know how to turn the whole house fan on. Does it work through the thermostat on the walll for the air- heat switch?


To turn on your whole house fan, got to you thermostat. Open the door and look for where it says fan, most will have a selector switch to select "auto" or "on". You want it "auto for it to work properly with your furnace and or central air. If you flip it to "on" it will run 24 hours a day none stop, warning this may shorten the life of your fan a little.

Jul 29, 2009 | Ventamatic Direct Drive Whole House Fan...

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Thermostat will not turn on for air conditioning


Turn fan to on position to see if fan runs. Is this new tstat. Digital or manual tstat. If digital check back of tstat to see if tstat is set to gas heat. Rus

Jun 21, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I have an amana package system heat pump model number phb30c02e , sometimes the indoor blower will not kick on thus making no air come in the home at all throught the vents, i tried a new copasitor and ...


Sometimes the thermostat can have a burnt place in the fan contacts. This stops the interior fan motor because the compressor wiring is not interconnected to the interior fan. The compressor command is the yellow wire. The interior fan command arrives from the thermostat on the green wire. Check the green wire for delivering 24 volts AC to the fan relay.

During heat, the heat is electrically interconnected with the interior fan. Thus, if the thermostat is bad, the fan will work properly during heating. I know July is a bad time to turn the heat on, but this is a method to see if the interior fan works properly and is not getting the proper command during cooling.

Jul 24, 2008 | Amana Heating & Cooling

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