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Old 05-04-2012, 11:17 PM   #1
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Air Conditioner Not Running on Generator Power

My rear a/c unit runs fine on both 50amp shore power and when running on generator power. However my front unit won't come on when on gen power. I can hear the "click" of the thermostat when I turn the control cooler but nothing runs. On 50amp shore power it works perfectly. Anyone have an ideas as to what to check? Thanks in advance for your time.

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Old 05-04-2012, 11:40 PM   #2
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There should be 2 breakers on your genny. Make sure both are flipped to on.

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Old 05-05-2012, 08:06 AM   #3
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If you look closely, I suspect you will find a few other things aren't working as well. Either the generator's own breaker for one power "leg' is tripped, or your auto transfer switch has a stuck relay and isn't switching from shore to genset on one side.
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Old 05-05-2012, 11:06 PM   #4
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Thanks

Thanks for the help. It was indeed one of the gen breakers. Not sure what tripped it originally but it's staying on now. Nice to have this forum for new RVers like me.
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Old 05-09-2012, 10:25 AM   #5
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Same problem! No AC on Gen power :(

I have the same problem, but none of the breakers are flipped.

The washing machine also won't even power on, much less work. I know there are some outlets also not functioning.
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Old 05-09-2012, 03:34 PM   #6
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Quote:
Originally Posted by JNTx3 View Post
I have the same problem, but none of the breakers are flipped.

The washing machine also won't even power on, much less work. I know there are some outlets also not functioning.
See the second item in Gary's quote. It is likely your transfer switch.

This assumes that your problem is also with genset power only. If your problem is with both shore or genset power, then check the inverter for popped breakers and for a GFI outlet that may be tripped.
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Old 05-10-2012, 09:21 AM   #7
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If your rig is 50 amps. Then not only the Front A/C but some other stuff is affected, and it';s a breaker on the generator.

If your rig is 30 amps, check the FRONT/REAR switch that selects which A/C works on 30 amps. It may be in the "REAR" position,

The REAR A/C is powered via the generator directly on 30 amp units with 2 A/C's when running on Generator (Of course they may have wired it backwards) . the front one via the aforementioned switch, (Both on shore and generator power). Said switch does not exist on 50 amp rigs.
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Old 05-10-2012, 01:10 PM   #8
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Junction box

Also, most motorhomes have a junction box coming off the generator that goes to the transfer switch. I had a wire nut fall off there once and lost a leg on the generator.
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Old 05-11-2012, 07:30 AM   #9
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Damn hair dryers and ac's running at the same time will trip those breakers often.
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