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Outdoor motor hum, but not start - Heating & Cooling

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Generally the electric motor for the condenser coils (outside) and the squirrel cage blower (inside) are on the same shaft. Motor bearings are binding. It's a fairly big job to undertake.

Posted on Jul 03, 2009

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Air compressor on Heil air conditioner is humming but not kicking in


Capacitor Failure Symptoms are sometime harder to identify without the right tools and expertise. Capacitors can be found in several different sizes and shapes. There may be one or multiple capacitors included in your ac with regards to the design. While the most popular capacitors are the types found on circuit boards, the ones most associated with air conditioning will be the bigger capacitors that assist start and run your motors. There are several motors present in an conditioner and heater systems:
  1. Compressor Motor Run Capacitor: Here is the most popular capacitor that fails. Most of the time these are duel capacitors, which means that there are 2 capacitors built into one. A duel capacitor will have three terminals on the top where a single capacitor will simply have two terminals on top.
  2. Outside Fan Motor Run Capacitor: That is the smaller capacitor found with or part of the Compressor Motor Capacitor. It helps start and run the outside fan that blows air through the outside coils.
  3. Indoor Blower Motor Run Capacitor: Similar to the outdoor fan motor capacitor, it is a small, single (two terminals) capacitor that will help start and run the indoor blower motor.
  4. Start Capacitor: Some models include an auxiliary start capacitor that helps jump start the motors. Most are found on the compressor. These are less common.

You may need to get that checked out.
Air Conditioning

Oct 16, 2012 | Heating & Cooling

2 Answers

Outdoor fan motor will not run, MAKING HUMMING NOSIE


Hello, if you try to spin the motor by hand or with a stick and it starts then the problem is a bad capacitor, if it does not start then the motor is shot.

Jul 13, 2011 | Ruud UAKA042 Air Conditioner

1 Answer

My unit was cooling yesterday and stopped today i put my gage it was 0psig i found a leak on the condenser fix leak and notice the condenser was so hot and not running not even humming.What next iam an...


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season.

Jun 16, 2011 | Heating & Cooling

1 Answer

Need help with timer it is making a loud humming noise but it is still tirning yard lights on and off


If its a older model the timer motor is wearing and will hum. The cold weather will make it hum even louder

Dec 20, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

1 Answer

Outdoor timer and started to make a humming noise


IT COULD BE THE TERMINALS ARE LOOSE TIGHTEN ALL OF THE SCREWS THAT HOLD WIRES ON TIMER BOARD.. ANOTHER THING I WOULD CHECK IS THE AMPS YOUR MOTOR IS DRAWING , MATCH THE AMPS TO THE NAME PLATE ON YOUR MOTOR SHOULD BE RIGHT AT IT OR UNDER ... THE NAME PLATE AMPS.. SO SAY A 1HP 1.0 SF MOTOR HAS A 7.6 AMP RATING AT 23O VOLTS THAT SAME MOTOR WILL SET TO 115V CAN DRAW 15.3 AMPS .. VOLT AND AMP METERS ARE CHEAP AND A VALUABLE TOOL AROUND THE HOUSE,CAR... NOW IF' I WAS ANY HELP TO YA ALL . HIT THE RATING OR HELPED BUTTON ........... THANKS AND BE CAREFUL EVERYDAY ... JAY

Jun 06, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

1 Answer

Outdoor unit hums but fan doesn't turn. Nothing heats up but the fan just won't turn and is there a spot to oil the fan on the motor


The fan motor on the outside unit should be a sealed motor. If the unit is just humming is the humming from the compressor or from the motor being locked up. You could try spinning it a few times with the power off to see if this might get it to run and spray some penetrating oil under the fan blade right where the shaft comes out to the fan blade.

Dec 24, 2009 | Heating & Cooling

1 Answer

Outdoor unit not coming on


turn on a/c and go outside. Listen to the condensing unit for humming from the compressor. If the outdoor fan and compressor wont come on, the capacitor may be bad and they dont have enough torque to start the motors.

Dec 12, 2009 | Heating & Cooling

1 Answer

UNIT RUN FOR APPROX 1HR. THEN OUTSIDE FAN STOPS RUNNING AND STARTS HUMMING


whats going on is your outdoor fan motor is over amping itself and causing it to go into heat overload shutting down the fan. It needs to be replaced

Jun 10, 2009 | Carrier Heating & Cooling

1 Answer

The fan hums wont turn goodman air conditioning


If you are talking about the fan on the outdoor unit, let's try some things.
Kill power to the outdoor unit. Use breaker or disconnect. Now see if the fan will spin with no power going to the unit. If not, bad bearings. Fan D.O.A. If it does spin, good.
Now restore power and turn unit on. If fan runs now, it has a defective or damaged winding. Needs replacing. If it does not start running, most likely the capacitor is D.O.A. or the fan is "Electrically" locked up. Again, fan D.O.A.
If you do replace the fan motor, be sure to always replace the capacitor. It's usually only a few buck more.
Also, be extremely careful when trying to spin that fan. It may take off and take a finger with it. NEVER try to spin the fan with power going to it.
This is no joke, it's dangerous if you don't know what your doing.
It may well be worth having a tech check things out for you.
In any case, good luck and again, be extra careful. Never do this type of work alone, in case something happens unexpectedly.
And as a side note, you may find it next to impossible to find anyone to sell you the motor. Most all HVAC parts houses are wholesale only and will not sell to the general public just to HVAC companys. That's because they are trained to do this stuff with out injury.
Think it over and good luck.

Mar 20, 2009 | Goodman CLJ30AR32 Air Conditioner

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