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Fan on unit will not turn on in cooling mode - Ruud Central System Air Conditioner

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Check to see if the green thermostat wire is conneceted to the "G" terminals on the thermostat and on the furnace.

Posted on Apr 21, 2009

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I have a Trane BLU055E936B1 furnace that the heat does not come on. The Pilot light is lit and I just replaced the Thermocouple. I do not have 24v on the gas valve solinoid. I do not here the Fan solenoid engage and I dont know how th check the overtemp black unit

Posted on Oct 14, 2009

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Posted on Jan 02, 2017

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1 Answer

My blower on my carrier furnace unit won't turn off? a/c or heater doen't turn on.


gas furnace??? check the start capacitor, put unit in ac mode and see if fan comes on(switch fan to on at thermostat) if it does not a fan problem or capacitor problem. when in cooling mode thermostat controls fan, when in heating mode, furnace controls fan

Feb 18, 2015 | Carrier Heating & Cooling

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Indoor fan will not stop


Seems like the fan relay has stuck (Likely to be on the main indoor PC board) or if the machine was being used on heating mode, the indoor pipe sensor may have failed causing the fan to continue to run. Most air cons on heating mode, will keep the fan running for a few minutes after you switch off on heating mode to cool down the indoor unit before it turns off completely. The pipe sensor signals the main PC board to tell it that the unit has cooled down and can now turn off completely. If either of the above faults occur, the indoor fan will keep running all the time.

Jun 19, 2014 | Goodman CKL36AR36 Air Conditioner

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Gmp 100-3 fan runs even when tstat is set to off an fan setting to auto. unit ran fine all summer in cool mode and was off for the last couple weeks. just notice the fan was on yeaterday. ran unit in...


Hello, one way to check is remove the green wire from the G termimal on the circuit board in the Furnace, if tn
His turns it off it may be a short in the tstat wiring or bad thermostat, if it does not turn it off the relay on tne control board is stuck and tne entire board must be replaced.

Sep 28, 2011 | Goodman GMS90703BXA Heater

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In Fan mode, fan works; but in AC mode, I can hear the normal AC sounds, except the fan never turns on. This is the fan in the lower half of the unit in the inside of the house, which blows the air...


on a call for air conditioning your therrmastat brings the indoor fan on and the out door unit at the same time. Since your fan comes on in "fan" mode, it sounds like you need a thermastat. For temp. cooling just turn your fan switch to "on" and turn system switch to cool and set desired temp. System will cycle off and on but fan will not shut off until fan control is set back to "auto". I suggest replaceing thermastat

Aug 16, 2011 | Heating & Cooling

1 Answer

When heater is on the fan turns off. when we switch the fan on the heat element turns off but fan comes on. one or the other works but not both at the same time.


In some unit heat mode will start the fan after few seconds. Wait for max 3 minutes. If you turn it to fan mode, fan will only work no cool or heat will respond.

Dec 26, 2010 | Heating & Cooling

1 Answer

Our window AC/heat unit fan only buzzes when turned on- no matter whether you turn on fan only or heat or cool mode.


so the fan does not spin and blow air? it could be a stick broken fan try free spinning it make sure its turned of. if fan spins freely its probably your start capacitor which is not to expensive.

Nov 10, 2010 | LG Heat cool Window Air Conditioner

1 Answer

Ac problem


Turn the thermostat off to see if the unit turns off. If it
does than you must have had a call for heating or cooling.

Put into heating mode let unit turn on, lower the setpoint and unit should turn off. If unit is not heating
than you have a problem with the outdoor unit.

Putinto cooling mode, turn thermostat all the way down, let unit start turn thermostat all the way up
if unit shuts off, unit is operating properly

Feb 06, 2010 | Heating & Cooling

2 Answers

Is it normal for fan on outside unit to be on while on heat mode


Yes, it is normal with a heatpump, you run the outside unit in cooling and heating.
It is also normal when the outside unit goes into defrost for the outdoor fan to shut off during the defrost mode and to see steam coming out of the outside unit, while it's melting the frost or ice, then the fan will come back on.

Jan 06, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

I have Goodman combination heating and cooling outdoor unit PBB series. I am wanting to know if when the heat is on should the fan outside turn or is that only ac


If it's a heatpump, then yes the outdoor fan will turn unless the unit is going in defrost mode. But for the majority of the time a heat pump is operating in heat mode, the outdoor fan is running.

Jan 16, 2009 | Heating & Cooling

2 Answers

Fan runs constantly on cool mode


Simple Question: Did you check to see if the fan switch on the
t-stat is in ON or AUTO? If ON the fan runs nonstop. If in auto the fan cycles with the outdoor unit.
next does the fan shut off if you turn the t-stat to off?
A stuck relay should keep the fan running all the time.
Sometimes if the relay is stuck you can whack the side of the Air Handler and the connection will break.
Sometimes instead of a relay there is a stack switch.
It's a little black stack of 3 disks this is a bi-metal switch.
they do get stuck more often than relays.
The fan relay may be on a electronic board. I don't know for sure without seeing your unit.
Good Luck Phil

May 18, 2008 | AmcorAire UCHW-H12AF2 Split System Air...

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