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Old 11-27-2017, 08:39 PM   #1
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Roof AC Fan Problem

When we turned on the fan last night it made a humming sound, shut it down and repeated with the same result. This morning I tried it again with the same result.

Have an appointment with a tech on Thursday so I tried the fan again this late afternoon and now it won't even go on. Any ideas as to what the problem might be so that I can relay that info to the tech. Don't want to go in blind if possible.
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Old 11-27-2017, 08:46 PM   #2
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I would try a new hard start capacitor.
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Old 11-27-2017, 10:07 PM   #3
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Try turning the fan by hand. If it is really hard to turn then you just need a new fan motor. Take the old one to Grainger and they can fix you up. Not real hard to replace.
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Old 11-28-2017, 06:05 AM   #4
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Agree the fan is bad. The capacitor only starts the compressor.
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Old 11-28-2017, 06:48 AM   #5
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My AC started to kick the breaker and was getting louder. Found the motor was almost froze up. Found a replacement online for ~$120 and replaced myself. Solved the problem.
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Old 11-28-2017, 07:02 AM   #6
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That happened to me. I removed the inside grill. The fan motor wasn't running. Spun the fan shaft and it started running. Went on line and downloaded the service manual. Went on the roof and opened a panel. Inside were 3 capacitors. One is a start capacitor for the fan. Removed it and went to Grainger. $6.50 later it was running again. Unit is a Coleman Mach.
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Old 11-28-2017, 08:59 AM   #7
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Quote:
Originally Posted by spdracr39 View Post
Agree the fan is bad. The capacitor only starts the compressor.

I'm pretty sure the fan has a start capacitor too! At least mine does.
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Old 11-28-2017, 09:43 PM   #8
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Quote:
Originally Posted by MSHappyCampers View Post
I'm pretty sure the fan has a start capacitor too! At least mine does.
Yes hard start is for both. When mine went it would hum, I could spin the blower fan and it would run.

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The (C) is compressor, the (F) is the fan side of the cap.

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Old 12-02-2017, 02:50 PM   #9
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Thanks for all the help. Just got a new fan installed and all is fine. This AC has been a problem as last year I had to replace the squirrel cage and now the fan. Hope all stays well.
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Old 12-14-2017, 08:21 AM   #10
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Roof AC Fan Problem

Occasionally the bushing in the fan motor need to be lubricated with white lithium spray or lithium grease. If the bushing get dry it can cause them seize up and burn out the motor. Most people don't understand this is also a frequent cause of the capacitor going out. An overheating motor due to lack of lubrication can blow the capacitor. So find out why the capacitor went out in the first place. At least twice a year taking the AC cover off the roof and servicing of the unit will make it go a long way and prevent serious problems. The coils should be cleaned a couple times of year too. The blower motor has to work really hard in high temperatures so it really needs a high temp lubricant type grease. My RV AC is over 10 years old, never had to replace a capacitor, still works like new.
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Old 12-14-2017, 09:53 AM   #11
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We also had the same symptoms as you and I hope this is not your problem. It happened to us several years ago when we had a 5th wheel. After removing the A/C cover I found the problem. Only took about 3 weeks to happen. The nest goes into the squirrel cage and it could not rotate.

Once they were all killed, a putty knife and a shop vac got everything back to normal. Working perfect after that.
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Old 12-14-2017, 11:44 AM   #12
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Exactly why I screened the housing vents.....from the inside with cover off...
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