Question about Weather King 12AJA4801AH Air Conditioner

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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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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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Posted on Jan 02, 2017

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

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 | Heating & Cooling

1 Answer

Remove radiator cooling fan from renault scenic 2001


Things to check before replacing the fan motor.
Relay Power Supply and Ground Unit
  • These are the first two components worth checking if your cooling fan is not turning on when you switch the air conditioning on -- which it should every time. As explained by AA1 Caricon1.png, a good relay coil will typically read 40 to 80 Ohms, but if the resistance is high, even if the coils still works, the relay will not, and you will see a failure in the system. It may also fail when the electrical load on the circuit is too high for it to cope, which is referred to as a "cut-out." When the coil has no resistance, the relay will need to be replaced with a new one because it will never work.
Thermostat Unit
  • The thermostat unit can stop cooling fan relays from working properly, since the two appear in series in the circuit, which means the electrical current moves directly between them so that when one is faulty, the other can be affected. If your relays are not performing well, you have the option to bypass the thermostat using a length of continuous wire. But the thermostat's function will then be lost if you cut it out of the circuit -- so bear this in mind before making final changes. Also check the integrity of the thermostat housing, which is responsible for temperature regulation as well, according to Car Tech Auto-parts.

Oct 26, 2012 | Cars & Trucks

1 Answer

Fan motor won't cut off when driving my linclon


The fan motor is already defective, that is why it cuts off.

Jun 14, 2012 | Cars & Trucks

1 Answer

Electric fan wont kick in jeep over heats replaced thermostat and two sender units


Sounds like your cooling fan relay is bad the jeep grand cherokees are known for this, first thing i would do is unplug the radiator cooling fan and run 2 jumper wires direct from the battery to the fan connector if the fan kicks on your fan motor is good and the relay is bad, if the fan doesnt kick on replace the fan motor with a new unit, the cooling fan relay on your particular model jeep is located under the passenger headlight and requires you remove the front bumper to replace it, however some people cut a small hole under the headlight to access the relay the faster way but if your not to keen on cutting holes in your car remove the bumper and replace the relay if the fan checks out and you wont be overheating anymore...

Dec 07, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Cooling fan will not kick on when warmed up but if you unplug the sensor it will work


Change the sensor? have you tried to replace this unit.?
The cooling fan must click on as the thermostat reaches the set level. The thermostat must switch on the controller relay to switch on the fan which will stay on till the thermostat cut off .

Sep 01, 2010 | 2002 Ford Taurus

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 | Heating & Cooling

3 Answers

1996 Chrysler T/C over heats


It takes a while for the fans to turn on. If not, it could be faulty temp sensor or fan relays which can be found by tracing the wires from fan motor.
I also recommend changing the thermostat and using a 50/50 coolant mixture. A thinner oil is also better at keeping the engine cooler. Same with synthetic oil

Aug 14, 2009 | 1996 Chrysler Town & Country

1 Answer

95 mercury tracer trio/ ford escort wagon


engine coolant temperature sensor unit!? you say you had a thermostat issue some times if you over heat these the switch above might cause malfunction! I just spent 7 hours on relays!! with engine running un plug coolant sensor temp switch if your fan comes on you have no relay issues!! or ground problem keep in mind this switch tells the system the temperature then when reached sends signals to relay the fan to come on! when I unplugged mine fan ran plugged it back in off!!! replaced switch works great this is the true way to test don't get$$ it out hope this helps you out also be sure you have no air locks in your cooling system and you properly bleeded out all air sense you changed thermostat.John

Aug 18, 2008 | 1994 Mercury Tracer

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