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A/c unit The fan motor won't cut off. I changed the relay switch and the thermostat, but it still won't cut off...

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Re: a/c unit

Check the fan timer if equipped. check stat wireing and make sure it is on auto. remove wire on g from stat and motor should stop.check for power to motor and remove on control or wire at a time unit it stops running

Posted on Dec 29, 2007

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My goodman split system AC unit is running but the fan won't run even when I switch it to fan on thermostat. Any ideas please?

Did you notice if there was a click at the blower cabinet when you were switching the fan switch back and forth? If it clicks you probably have a bad fan motor. If it doesnt you may a bad thermostat, relay or relay board. Hope this helps good luck

Aug 14, 2013 | Air Conditioners

1 Answer

My fan runs continually, even when I switch the thermostat to 'off' between the heat and cold setting.

There would be a relay,or transistor malfunction in the unit that controls the fan motor.

Apr 16, 2012 | Air Conditioners

1 Answer

When car is just ticking over it keeps going up to the red i have changed the thermostat checked all fuses but the fan does not kick in i put a wire to the fan on to the battry and it works

Possible that the Temperature sensing circuit or the relay to the fan is faulty. You need to trace the wire of the thermostat to find the sensing unit as unless the unit process the thermostat change of value the relay will not be triggered to switch on the fan.

Apr 23, 2011 | Air Conditioners

1 Answer

My RV AC unit was runs good on high cool last night but this morning it was only running on low fan(some what cooling it Seems)What should I check first. thermostat,fan ???

low medium high speed of fan iscontroled by selector switch on the thermostat or recheck the thermostat if ok check control wirnig from thermostat to the fan relay on control borad and from relay to the motor.

Sep 03, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Coleman Presidential 7670 furnace in a mobile home. customer said it came on a couple of times by itself. I ran new wire, fan won,t shut off. Replaced fan switch, fan still won't shut off....

Brian, it sounds as if possibly the fan relay is stuck however, if the fan will not shut off I would suggest the following, Follow the wires from the fan to the relay on the relay disconnect the fan wire there and see if the fan shuts down if so there is the problem. If not you possibly have a short in the thermostat wire What can be done is take a small section of thermostat wire and disconnecting the existing thermostat (red 24 v power feed, green, is fan motor control, yellow is compressor control, white is heater control,) once you have disconnected the existing thermostat wires take the short peice of wire and connect it to the terminal block, once this done the other end (do not hook the wiring to a thermostat have the wires bare at the ends about 1/4 inch) Manually connect the red and green wires togather and see if the fan activates. If it does disconnect the r,g wires if the fan still runs then the fan relay is stuck, if not then it sounds as if there is a short in the wiring between the thermostat and the terminal block. Also check to make sure that you have set the thermostat setting itself to either gas or electric since the newer thermostats have the option of being used as gas or electric. Good Luck on your repairs.

Dave in Texas

Sep 01, 2009 | Air Conditioners

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 | Air Conditioners

1 Answer


Check your furnace for power. will be 4 wires. power ground and 2 thermostat wires. Check for power at the time delay relay, if you have power there check for power going in the fan motor, if power in motor wire, motor is bad. If no power in motor wire and power going to circuit board take the 2 thermostat wire apart and wrap the 2 together comimg from the thermostat. Fan will stat in about 30 seconds. If it does you need a control kit in the ac. But sounds to me like you have a furnace problem.

Jan 14, 2009 | Dometic Air Conditioners

1 Answer

Intertherm air conditioner split unit

you need to know if the heat strips are energized by a contactor or relay as opposed to a heat sequencer. as a general rule the contactor or relay clicks shut as soon as a call for heat is made and the fan is energized by the stat at the same time . instant heat strips and instant fan. if the heat strips have a sequencer it may take up to 90 seconds or so before the sequencer heats up then clicks and puts power to the strips and the fan motor at the same time. the high voltage usually feeds from the strip side of the sequencer through the normally closed side of the fan relay. if you changed the stat and didn't switch the fan setting switch to elec, the fan will not be energized by the stat. if it is in the gas position, you have told it that the sequencer is bringing on the fan and of course it won' t if you don't have a sequencer.. this is tough stuff to trace even for an experienced pro cause its interconnected so dual fan speeds can't be energized at the same time. most likely you have a new digital stat that was not programmed correctly to bring fan on in heat. good luck

Nov 12, 2008 | Intertherm Air Conditioners

1 Answer

Indoor unit runs continously changed thermostat unit still runs continuously heat does not come on

fan relay or fan time delay board is bad track wires from fan motor back to relay tap it gently and if motor goes off relay was stuck on. replace relay wire for wire , usually a 90-340 universal relay will work but you need to know how to wire it, maybe best to get exact repl and change wire for wire.

Sep 21, 2008 | Goodman Air Conditioners

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