Question about Coleman Mach III Air Conditioner

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RUNS ON FAN BUT COMPLETELY SHUTS OFF WHEN GOING TO COOL HIGH OR L

FAN RUNS BUTWHEM I GO TO COOL HI OR LOW STOPS

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Sounds like a faulty Switch.  Let us know if you need more assistance.  

Posted on Mar 11, 2009

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Posted on Jan 02, 2017

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2 Answers

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

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

1 Answer

Intertherm a/c hardly blows on low fan setting


are you saying the outdoor unit does run, then shuts off?

if not, there may be fuses in the disconnect

if so, it may be going out on low pressure, possibly high pressure....clean all coils, filter, blower wheel, inspect coil if possible

Jul 26, 2012 | Dometic Rooftop RV Air Conditioner

1 Answer

This is a Unico AIR HANDLER in a residential application with heat / cool unit in the attic. With system off (not calling for cool) and fan in auto mode, the blower fan is on high speed only constantly....


Sounds like a sticking relay. You can check the stat simply by remove the faceplate. If fan still runs with tstat cover off its not the stat. Not sure is your blower has a separate relay or if relay is mounted on control board. This can be bypassed with a new relay if you are willing. Good luck!!

Mar 26, 2017 | Heating & Cooling

1 Answer

The fan on my emerson microwave model#mwg9115sl stopped working and now it shuts off by itself is there a way to fix it or someone who i can take it to?


The fan primary function is to keep the magnetron cool while it runs, if the fan stops the thermal fuse senses an increase in temparture causing the oven to shut down. I suggest a tv technician or appliance repair man because there is dangerous high voltage present that can cause serious injury or death.

Jan 15, 2011 | Emerson Microwave Ovens

1 Answer

Fan noise-fan lags speeds up to normal then slows and will eventually stop. This occurs on fan only operation (high and low) and cool high and low.


The bearings,or bushings in the fan motor are gone out,the friction eventually slows,or stops the fan motor.

Jul 01, 2010 | Heating & Cooling

1 Answer

Fan runs, shuts down on cool


Sounds like a power supply problem. There is enough power to run the fan but when you turn it to cool the current draw by the compressor drops the voltage. The lower power light is telling you the answer to your problem.

Jul 17, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

High cool not working


Compressors on these units runs at only one speed. The change to high cool is only a change in blower speed moving air faster over the cooling coil. I would have the running capacitor for the fan motor checked. A bad capacitor can cause your type of problem. The other problem could be that the high speed winding in the fan motor is bad. Try it operation in the fan only position through the two speeds. If it works in the low and high speed for fan only your problem could be in the selector switch.

Jun 23, 2008 | Dometic Rooftop RV Air Conditioner

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