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Indoor fan motor continue to run even if the thermostat is in auto position with the cool and heat switch in the off position. The furnance don't have a fan on and off switch in the furnance like most. The only way to turn the fan motor off is to turn off thr high power switch. I change indoor fan relay but the problem still exist.

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Try this, disconnect the fanwire (green) on the furnace, if it shuts off then the hot wire from the thermostat is touching the green wire or bad thermostat. Thank-you-very-much!

Posted on Aug 26, 2008

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2 Answers

Indoor blower won't shut off on heat pump


I would look to replace a relay that is not shutting off or replace the thermostat itself.

Nov 14, 2015 | Honeywell Heating & Cooling

1 Answer

I am new to a heat pump. The thermostat has an 'auto' setting and an 'on' setting. I am confused as to which one to use for heat. Can you help me?


n most heat pump thermostats you have two control switches and the temp setting. One control switch will say "Heat", "Off", "Cool" while the other says "On" and "Auto". The three position switch is for whether you are heating or cooling. The two position switch is for the fan control. "On" will make the fan run constantly whenever the three position switch is in HEAT or COOL mode. Some people use this to circulate air at all times. MOST people use the AUTO mode, where the fan is controlled by the circuitry and runs during the times of heating and cooling only.

Oct 16, 2015 | Heating & Cooling

1 Answer

My blower motor wont turn off in my furnance?


check the fan setting on your thermostat. On means always on, auto/int means only comes on during heating/cooling. if the thermostat is set to auto / int and the fan keeps running? you may have a bad fan relay switch. It may be integral on the primary control board of your unit.

Sep 04, 2014 | Heating & Cooling

1 Answer

Furnance running all the time never shuts off


Turn the thermostats fan position to Auto instead of ON. If it already is in Auto, then there is a fan relay stuck in the board.

Dec 13, 2013 | Goodman Manufacturing Goodman AEPF313716...

1 Answer

IN THE MIDDLE OF COOLING THE AIR CONDITIONDER ( OUTSIDE UNIT) STOPPED WORKING AND THE BLOWER MOTOR CONTINUED TO RUN PUSHING AIR THROUGHT THER HOUSE. THE THEREMOSTAT CONTROL WILL NOT SHUT OFF THE...


make sure your thermostat is not set run the fan,
is there an auto/on switch on the thermostat subbase?
if so then switch it to the auto position

Jun 17, 2011 | Heating & Cooling

1 Answer

Air will not come out when turned on smell of burned oil. A/C is also effected


Do this.

1.)At your thermostat...Turn system switch to off position(dont have it in heat,cool, or auto mode).
2.)At your thermostat...put fan switch from auto to on position.
Do you have a indoor fan(is air coming out the small registers in ceiling or floor).
Do you smell "Oil" smell(most likely an electrical smell).

If you have no indoor blower, a bad smell, most likely your indoor blower motor fried, your control box has fried,or a combination of both.

Hopefully it's just a fan motor but the smell should go away after a bit.It shouldnt linger for days.

My guess if it lingers you burnt your transformer from a low side short.

Call a tech.

Jul 29, 2009 | Heating & Cooling

2 Answers

The fan in the airhandler wont shut off.


The fan is controlled by a blower timer board located inside the air handler, or on older units it has a relay called (of all things) a blower relay. If these items were at fault I doubt removing the thermostat would cause the blower to go off. if bad causing this problem the blower would continue to run even with thermostat removed.

But it is also controlled by the thermostat.

You mentioned that if you remove the thermostat it cuts off. There are 2 switches on most thermostats.
1 has Cool, Off, Heat, and Emergency Heat (on a heat pump stat)
2 The other switch has On and auto (it is for the fan motor only)

I believe because it stops when you remove the thermostat that the switch on the fan is set to on possibly. It should be on auto-matic. This way the fan motor only come on with cooling or heating. If in the on it stays on all the time. If this is the case just switch to AUTO.

Or the thermostat may be wired wrong. The G terminal is where the fan motor gets instructions from the thermostat. Make sure its on G at the stat and the correct wire at the blower coil is being used for the corresponding wire going from the stat to the blower for G. Don't confues G for green it could be any color. The terminals are not for color but it makes more sence to make them color - letter identified. On the other end soemtimes the wires are not colored the same so look carefully.

Also a whisker of a thermostat wire could be touching inside the thermostat and causeing the motor to run 100%. Look carefully at this and see if it has too long of thermostat wires stickinhg on out under the screws to where they may tough other things.

If neither things stop or show the problem and it deffinately stops when thermostat is removed the thermostat is most likely bad.

If this helps you 1 way to make the repairs your\self or helps you realize you need a technician please rate mne as high as you can.

May 14, 2009 | Heating & Cooling

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

Mar 28, 2009 | Carrier Heating & Cooling

3 Answers

Ptac fan keeps blowing


Try setting the fan control to "AUTO" this will cause it to cut out with the compressor.

May 02, 2007 | Amana PTH123B25AJ Heat Pump Air...

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