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Old 09-14-2020, 07:47 PM   #1
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Dometic A/C trips breaker

The front unit has been tripping the breaker after running for 10-15 minutes, even after fixing the fan.
The rear unit works fine.

I took the cover off and the rear squirrel cage fan was warped. Made of plastic and couldn't stand the 115 degree heat I guess.
I replaced it with a metal one.
The unit still trips the breaker. I have 113 v at wall plugs. Using an extension cord with no. 12 wire.
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Old 09-15-2020, 12:30 AM   #2
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Quote:
Originally Posted by National 350 View Post
The front unit has been tripping the breaker after running for 10-15 minutes, even after fixing the fan.
The rear unit works fine.

I took the cover off and the rear squirrel cage fan was warped. Made of plastic and couldn't stand the 115 degree heat I guess.
I replaced it with a metal one.
The unit still trips the breaker. I have 113 v at wall plugs. Using an extension cord with no. 12 wire.
Replace capacitors; had to replace mine the other day at home as fan was not starting every time; saw/ felt found slight bulge, NOTED AD said "Guaranteed Five Years", yeah, about year six, :-)
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Old 09-15-2020, 08:43 AM   #3
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Have you checked the amperage draw when running.

Ken
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Old 09-15-2020, 01:28 PM   #4
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When you changed the fan did you notice if the motor was turning freely.

I had the same symptoms, I did change the capacitors but it didn't help. Finally checked the motor and it was almost seized up, I could barely turn it by hand. Replaced the motor and all is good.
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Old 09-15-2020, 11:14 PM   #5
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Quote:
Originally Posted by National 350 View Post
The front unit has been tripping the breaker after running for 10-15 minutes, even after fixing the fan.
The rear unit works fine.

I took the cover off and the rear squirrel cage fan was warped. Made of plastic and couldn't stand the 115 degree heat I guess.
I replaced it with a metal one.
The unit still trips the breaker. I have 113 v at wall plugs. Using an extension cord with no. 12 wire.
ALSO Possible that breaker is simply weak; cheap, easy swap breaker w/ the other 20a and see if problem moves?
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Old 09-16-2020, 12:13 AM   #6
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Originally Posted by jacwjames View Post
When you changed the fan did you notice if the motor was turning freely.

I had the same symptoms, I did change the capacitors but it didn't help. Finally checked the motor and it was almost seized up, I could barely turn it by hand. Replaced the motor and all is good.
Yes, the motor turns easily.............
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Old 09-18-2020, 07:21 AM   #7
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Quote:
Originally Posted by National 350 View Post
The front unit has been tripping the breaker after running for 10-15 minutes, even after fixing the fan.
The rear unit works fine.

I have 113 v at wall plugs. Using an extension cord with no. 12 wire.
Have you monitored the voltage when the front A/C tries to run? If you are supplying the entire RV from an extension cord of that size then you probably get a big voltage drop when any A/C starts and the lower the voltage the more current the A/C motors will draw. Since the front unit is almost always a larger one than the rear, it would be likely to show there first. Try connecting your RV to a proper RV power outlet and see if things work.
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