Out door unit was making terrible noise for couple of days, then outdoor fan stopped running.I thought fan motor froze.I got a new fan motor.After installing the new fan motor and a capacitor, turn the unit on, fan was not running fast enough.After few min, fan stopped.Fan motor was really hot.I think internal overload kicked the motor off.Compressor still runs.I had a new connector; I replaced that also, and did not make a difference.Please let me know if you have any experience with this.thanks.......
Thanks for the suggestion. I figured out the problem. The replacement fan motor I bought was general fan motor. it had 5 wires. Two of them went to the capacitor (this unit has combo capacitor, 3 leg). I followed the schematicdiag on the motor and connected one leg to the C and the other leg to the FAN on capacitor. what was happening, the start winding was working against the run winding in the motor. Once I switch the wires in the capacitor, fan ran at full speed. thanks again for your reply.
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Malfunction of Outdoor Unit Fan Motor (
Abnormality of fan motor system is detected according to the fan speed detected by hall IC when the
fan motor runs.
When the fan runs with speed less than a specified one for 15 seconds or more when the fan motor
running conditions are met
When connector detecting fan speed is disconnected
When malfunction is generated 4 times, the system shuts down.
?? Malfunction of fan motor
The harness connector between fan motor and PC board is left in disconnected, or faulty connector
Fan does not run due to foreign matters tangled
Clearing condition: Operate for 5 minutes (normal)
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
Replace the outdoor unit fan motor.
Connect the connector.
Remove the foreign matter.
Are fan motor
Replace the outdoor unit fan motor.
Is the pulse input?
Check No. 11
Check for pulse input
for number of rotations
on the outdoor unit
Replace the outdoor unit PC board.
any foreign matter
around the fan?
Can the fan be
easily rotated by hand?
Unit needs to be taken apart and washed out , also check to see if motor turns freely by hand , clean base of unit fans / blowers and drain ports / channels . Check outdoor motor to see if bearings are tight or fan overheats and cuts off if so replace outdoor motor .
Your evaporator fan motor would be the cause of your noise. Yes, it can be repaired, just need to replace the fan motor. The noise stops when you open the door because the fan motor turns off when the door is open.
I realize the outdoor unit has a new compressor and fan motor - therefore - both those components should be ok - however - the fan motor 'should not' be going off - and the fact that it is going off is what is causing your compressor to overheat and shut off.
The reason the fan motor is going off is - it is bad (breaking down electrically) and is going off on the internal overload. If this is the case (a) the motor needs to be replaced or (b) it's possible that the fan capacitor needs replacing; but fan capacitors generally do not cause much problem, and when they do go bad they usually develop an obvious (to the eyes) bulge. If the capacitor has a bulge in it - I would surely change it out -and probably would (as a shot in the dark) anyway - since they are relatively cheap ($10-$15).
In your complaint you say that "the outdoor fan will stop running and compressor overheats and shuts off." If it happens 'exactly' that way then I'm betting your problem will be that the fan motor is defective as mentioned above, with an outside chance of the capacitor being defective, in which case if it isn't the capacitor - you will need a new fan motor. Note: outside fan motors are notorious for being fickle and it would not surprise me in the least to find a fairly new outside motor that is defective. I would check and see if you had any warranty on it.
All that being said - it is also possible that your outside unit has a 'high pressure cut-out switch,' although most units don't have them anymore, these days. However, if you have such a switch - it is possible (very likely) that it is shutting off the AC. Note: a high pressure cut-out switch will 'shut the entire outside unit off,' not just the fan motor. If that is what is happening then there's a good chance you have such a switch.
If it is happening that way, (the entire outside unit stops) then I would try 'washing the outside coil' really, really good and see if it will run ok afterwards.
Note: outside coils are sometimes difficult to get clean - sometimes requiring you to disassemble to some degree in order to make sure you get them clean.
Always, Always turn all power (including inside thermostat) OFF when washing the outside coil.
Yes.Think of a heat pump as a A/C in reverce in cool indoor coil is cold&outdoor coil is hot.Naw indoor coil is hot &outdoor coil is cold&fan is pulling in cold air from outside.its going to iceup& go into defrost cycle.If your unit has a timed defrost every 30,60,or90min.(witch ever yours is set for)Defrost control board checks a sensor on cond.coil,if it is frozen unit goes into defost.You will here a swishing noise,iis the reversing of refrigerant.you will also notice the outdoor fan is not operating&at termanation of defrost fan will blow out steem.the other metod is on demand defrost.when coil freezes unit defrosts.
Sounds like a charging problem. When your battery runs low there is not enough current to operate the sensors properly. When you charged the battery it thought the system was fine till it gets low again. I would have your alternator checked and battery. Good luck and have a great day.