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My ac fan motor runs but my compressor is not what is the problem?

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Try changing capacitor.

Posted on Sep 14, 2015

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Good morning everyone! My marine AC unit is making noise- I'm not sure if is the compressor - suggestion anyone pls? Thanks!


You will have to open it up to see if it is the compressor or the fan motor. You will see the fan wobble when running. Replace the motor Could be the fan also.. If it runs true. replace the compressor. May be cheaper to replace the whole unit.

Jul 25, 2015 | AC Cars & Trucks

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Dometic 3000 plus RV AC outdoor fans not running when compressor on.


With your info I can only surmise that it is, as you stated, the PCB or one of the relays that provide the power to the fan motors. The fact that the compressor is running means your getting power to the board. The likelyhood that both fan motors have failed is highly improbable. To test the fan motors you could, if you have some knowledge of electricity, disconnect the high side wire from the relay to the fan and jumper a wire from any source of 120vac to the fan and verify whether the fan motor is defective or not. If you don't feel comfortable with electricity by all means do not attempt troubleshooting the AC.. Take it to an RV repair station.

Mar 02, 2015 | Dometic Rooftop RV Air Conditioner

1 Answer

Ac fan not running, but compressor runs on and off


switch/ fuse possible if it has one, if not one of the wire going to the motor was severed, or the start up capacitor of the motor if it also has one.

Jun 04, 2013 | Frigidaire FAX054P7A Wall/Window Air...

1 Answer

Kenmore central air conditioning unit tripping breaker each time we turn it on.


The breaker tripping when you turn the unit on indicates a 'direct short' and 99 out of a 100 times the short will be either the outside fan motor or the compressor itself. Either way - you will need a qualified serviceperson to diagnose this problem correctly and make the needed repairs.
Best solution is to call AC person.
However, here's a good way you can get it down to either the fan motor or the compressor.
(1) With all power OFF - disconnect the wires to the fan motor
(2) turn on AC unit (a) if breaker trips it means the compressor is probably the shorted component. (b) if breaker DOES NOT trip and the compressor runs - it means the fan motor is shorted.
(3) If breaker tripped with the fan motor disconnected meaning the compressor is probably shorted you can then (with ALL POWER OFF) 'disconnect the wires going to the compressor' and re-connect the fan motor wires. Turn on power - and if fan motor runs (with compressor wires off) you know it's the compressor that is shorted.
After all this you will now know which of the two (compressor or fan motor) is shorted.
If it's the fan motor you can with 'limited mechanical experience' change the motor yourself, but if it's the compressor you will need to call a serviceperson because of the expertise needed to replace the compressor.

Jun 05, 2011 | Kenmore Heating & Cooling

1 Answer

Jump air compressor ac works replace relays same issue HONDA


the compressor may be low on freopn but, the fan problem is most likely the fan motor as it is the low temp fan and will run more often than both fans...to test see if you can switch the fan plugin to the other fan watch carefully that it does not get too hot as the second fan is a safety fan that works as high temp or when using the A\C

Jul 13, 2010 | 1997 Honda Accord

1 Answer

My Goodman ac unit is still running but it just feels like the fan not ac. We don't know the problem but guessing the dual Air conditioning/heat Pump (CapacitorGSC130421AC) is bad. Please advise! Thank you...


If the fan motor on the outside condensing unit is running, but the compressor is not coming on, then yes, most of the time it is just a capacitor. It could also be the compressor has a short or bad valves. If the compressor comes on in the beginning, but shuts off while the fan motor is still running, then you could have a low/high charge, and the unit trips the internal overload switch because it overheats. Hope this helps.

Jul 01, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Home ac compressor fan won't turn all the time.


your looking at $175-$225 for just the single phase motor depending where you purchase, I just replaced mine(identical unit) due to screaming dry bearings, if you replace it your self make sure to keep new wires tight along side of unit or fan will cut them if loose and its a fan- 5mfd/25mfd compressor@440volt cap

Sep 27, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

On third compressor. Had the temperature sensor


With the AC on, the fan will come on to help the ac codensor. Why your compressor keeps crapping out is definately something to look into. If your AC is overcharged the head pressures can get pretty high and if the oil is low, that would not help either.. Good Luck.

Aug 03, 2009 | 2006 Chevrolet Equinox

1 Answer

Samsung Ac compressor stops after 20 minutes and fan keep running. Again after 10-15 minutes if ac is restarted the cooling happens for 20 minutes and compressor stops.


eventually,cycling process is doing done if the thermostat sense the configure temperayure set up it will trigger to stop your compressor motor as well as the blower fan,blower fan independenly to you compressor.if your thingking that your compressor is tripping off,check your operating current on one line using clamp ammeter and compare to the rated current that tag on
motor compressor body,if the current flow is higher than the rated current specified on compressor motor,well problem occured it will trip your compressor,because overload protector is becoming your thermostat.but if you got same current result it was cycling process.If tripping off maybe air is present in your system call qualified ac tech, to purge out air in system.

Mar 15, 2009 | Samsung AW0693L Air Conditioner

1 Answer

High Pressure cutoff


YOUR OUTDOOR FAN MOTOR SHOULD NEVER SHUT OFF IN THE AC MODE. IT IS SUPPOSED TO SHUT OFF IN THE HEAT MODE WHEN ITS IN DEFROST. IF THE UNIT IS RUNNING IN COOL AND THE OUTSIDE MOTOR QUITS ,THE COMPRESSOR WILL QUIT SOON AFTER. EITHER THE RUN CAPACITOR FOR THE FAN IS BAD OR THE FAN MOTOR ITSELF IS BAD, IF CAP IS GOOD THEN THE MOTOR IS At FAULT. THE OUTDOOR PRESSURE SWITCH CAN ALSO OPEN IF THE INDOOR FAN MOTOR FAILS IN HEAT OR THE FILTER IS PLUM NASTY in heat OR THE INDOOR COIL IS PLUGGED UP in heat.. THE PRESSURE SWITCH USUALLY TRIPS AT 400 TO 425 SO ITS WORKING CORRECTLY. YOU MAY BE CONFUSING THE ISSUE SAYING THAT THE AIR IS HOT AND COLD INSIDE. IT IS COLD WHEN AC IS RUNNING HOT WHEN HEAT PUMP IS RUNNING IN HEAT BUT ESSENTIALLY not cold or hot if compressor isn't running, but a lot of folks describe the lack of cold air as hot when the compressor isnt running. but it basically is warm or house air temp.you test the capacitor with a capacitor tester or take it to motor shop and let them test it. odds are its a 5 , 7.5 or a 10. it should test within 10 % of rated value . ask for a RESCUE brand replacement motor. they are great ,reversable etc.carefully oil and sand the motor shaft and note exactly where the blade was located in relation to the grill so you get it back just the same. usually they wire up black to a leg of 220 power. white to the other leg of 220 power. brown and brown with white stripe to the capacitor.you can also pull whole fan shroud assembly on some units and take whole thing to motor shop and let them test motor cap, replace and all you do is return to unit and connect two power leads,

Oct 26, 2008 | Heating & Cooling

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