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Old 06-07-2019, 08:22 PM   #1
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AC not working on generator.

My air conditioning unit works great when I am connected to 30amp service. However when I switch over to my generator it will turn on for about two minutes and shut down. I cannot even get the fan to work. I reset the breaker and nothing changed. I could not even get the fan to turn on. I made sure that there were no other power drains.
Ideas?
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Old 06-08-2019, 05:21 AM   #2
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Check your generator for two circuit breakers that might be present on the generator. If either one is tripped, reset it. Each breaker is for the two legs of your 50 amp service in the coach (if you have 50 amp service).
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Old 06-08-2019, 08:15 AM   #3
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My rig is 30amp. All outlets work. Just not AC
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Old 06-08-2019, 08:51 AM   #4
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You mentioned re-setting the breaker. Are you doing this just to be sure everything is OK or is it tripping?
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Old 06-08-2019, 10:11 AM   #5
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Just to be sure.
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Old 06-08-2019, 07:03 PM   #6
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Have you checked the voltage coming from your generator with a multimeter? If it's low, the A/C is going to draw more amps than normal which could cause your power management system to shut it down. You say the outlets work but did you test the voltage at them with a multimeter? If you just plugged something in, like a lamp, to test, low voltage wouldn't necessarily be a problem. Your generator should be putting out 112V - 125V (no load) according to the following:

https://www.partsfortechs.com/asapca...20RV's.pdf

If it had anything to do with your thermostat or A/C itself, it wouldn't run on shore power.
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Old 06-10-2019, 08:08 PM   #7
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Checked the voltage at the generator plug. Read 121.
Hooked up my EMS on generator plug. It didn’t detect any errors.
AC still not working.
Any other ideas?
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Old 06-10-2019, 09:10 PM   #8
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Did it ever work on generator power or is this something new?

1. I've been dealing with some transfer switch issues, which I know you don't have, but many of the threads I've been reading cite problems relating to loose connections. I suggest opening the generator outlet box and tighten all the connections (really tight). A loose connection could supply enough current for your outlets but not the A/C. Do the same where the wires from the outlet box connect to the generator and its breaker. There may or may not be signs of burning or other damage.

2. It's also possible that your generator just isn't putting out the amps it's supposed to be putting out. If this is the case you might also have problems running your microwave at full power. The generator breaker could also be faulty, breaking down but not "tripping" at higher current loads, or it could be something more complicated, but let's check the simpler things first.

Note that your EMS wouldn't necessarily detect any of these issues since it's only checking voltage and polarity, not current handling capability. Note that current, contrary to voltage can only be measured under a load.

The nice thing about not having transfer switch is that, since everything is fine on shore power, your problem has to be somewhere in the generator outlet box, the wires from it to the generator, the generator's breaker or in the generator itself. You know you're OK from the shore power plug to the A/C.

Your generator manual should have a troubleshooting section that may help.
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Old 06-11-2019, 08:50 AM   #9
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Note that your EMS wouldn't necessarily detect any of these issues since it's only checking voltage and polarity, not current handling capability. Note that current, contrary to voltage can only be measured under a load.
i missed the fact that the EMS also checks frequency.
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Old 06-11-2019, 02:10 PM   #10
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Thanks Bob, I’ll check the connections.
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Old 06-13-2019, 07:35 AM   #11
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There's another, similar thread on this topic:
http://www.winnieowners.com/forums/f...er-354659.html
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Old 06-13-2019, 01:13 PM   #12
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Quote:
Originally Posted by Billt View Post
Checked the voltage at the generator plug. Read 121.
Hooked up my EMS on generator plug. It didnít detect any errors.
AC still not working.
Any other ideas?
Stick your meter in any of your AC outlets and monitor the voltage while running the A/C when the generator is supplying power.

The voltage will probably drop a volt when the fan comes on and then you will see a good sized voltage drop when the compressor starts, but it should quickly come back up to within 4-7 volts of the generator no load voltage.

If the voltage doesn't come up a lot of the earlier suggestions (loose connection, etc) need to be checked.

If you can, do the above voltage checking when on shore power first. This way you have a bench mark of a working system to compare to.
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