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Old 05-22-2016, 10:29 PM   #1
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Question on AC fan......

Actually this is in my Lance camper but a DOmetic AC is a Dometic AC.

The squirrel cage fan will not spin on any of the settings unless I take the cover off and get it spinning by hand. Then it will spin fine on any speed....until you shut it off then you have to do this again.

Is there a start capacitor for the fan...usually there is I thought on AC motors where direction of rotation is important....?

Anyone have this issue and fix it. Not wanting to replace a whole unit.

The fan does not have any binding I can feel when not powered on...spins fairly easy.
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Old 05-22-2016, 10:32 PM   #2
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Actually this is in my Lance camper but a DOmetic AC is a Dometic AC.

The squirrel cage fan will not spin on any of the settings unless I take the cover off and get it spinning by hand. Then it will spin fine on any speed....until you shut it off then you have to do this again.

Is there a start capacitor for the fan...usually there is I thought on AC motors where direction of rotation is important....?

Anyone have this issue and fix it. Not wanting to replace a whole unit.

The fan does not have any binding I can feel when not powered on...spins fairly easy.

I believe you will need a new fan motor , the start capacitor on the AC operates the compressor . not to bad a job at all anyone that can turn a screw should be able to do it , easy access
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Old 05-22-2016, 10:35 PM   #3
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Yah I thought the start cap was on the compressor...I just could not remember.

Do you know by off chance if the squirrel cage fan motors are easily ordered from Dometic...or?

I will research it tomorrow anyway. Don't need AC tonight anyway just found it not working when we set up for our daughter.

I appreciate the response.
scott
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Old 05-22-2016, 10:38 PM   #4
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The blower motor also has a capacitor. Usually it is a dual capacitor, blower motor and compressor.

Rick
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Old 05-23-2016, 09:35 AM   #5
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Yah I see that now on the schematic for the wiring. Might try just replacing that first...then the motor if that isn't it. Motor isn't bound up or feel any resistance so...we will see.
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Old 05-23-2016, 10:13 AM   #6
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Yah I see that now on the schematic for the wiring. Might try just replacing that first...then the motor if that isn't it. Motor isn't bound up or feel any resistance so...we will see.
Does your compressor start up ? if so then you'll need a new blower motor . Let us know what you find how much time it takes you and how much extra money you spend
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Old 05-23-2016, 10:39 AM   #7
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Compressor sounds like it is running normal...not like it is stuck. Usually when they don't start it is very obvious. However I need to actually take the cover back off and hand spin the blower and put it on AC and make sure the compressor is running properly and getting cold.

Will try that shortly....was not too into it last night.

I see they sell an AC kit for it with blower motor...fan..squirrel cage and cap. Probably best bet verses buying this and that and ship multiple times I suppose. Granted that the only issue is the blower.
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Old 05-23-2016, 10:55 AM   #8
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Agreed may as well do the whole kit instead of nickle and dimeing it . not uncommon for the blower motor to go bad like you describe even with a good capacitor.
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Old 05-23-2016, 11:13 AM   #9
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The compressor works....just ran the AC and it gets cold...just had to hand spin the motor.

So no big I guess. Order the motor kit.....could be worse...could have to replace an entire AC unit.

Thanks guys,
Scott
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Old 05-23-2016, 12:35 PM   #10
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Yah I see that now on the schematic for the wiring. Might try just replacing that first...then the motor if that isn't it. Motor isn't bound up or feel any resistance so...we will see.
1. Make sure all power to rooftop unit is off (at circuit breaker)
2. At the capacitor, remove wire from terminal marked "fan"
3. Measure resistance between this wire and terminal marked "common" on capacitor.
4. If this resistance is infinite your motor run winding is open (bad), replace the motor.
5. If the resistance is some 10's to 100's of ohms, it's MOST likely a bad capacitor - change it.

It's far more common for the capacitor to fail than for the motor to fail. Good service practice calls for capacitor replacement anytime you change a motor. There's nothing to lose by trying the capacitor change first.
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