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Old 08-01-2014, 04:59 AM   #1
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AC Issue

Well it wouldn't be another month without me posting about a problem with this trailer yet again. Just got home tonight and my wife arrived 30 minutes before me and I noticed the trailer was hot and she was using the bedroom ducted unit. Normally the center non ducted unit is the one we use while at work during the day for the pets and when we get home the other unit is kicked on until we can kill the center unit. So I asked her about it and she said she was sorry to tell me that it was off when she got home and the trailer was roasting and the only air was from the ceiling fan and the other fans going. The thermostat is showing an E7 which is a 120v error so has anyone experienced this on a Dometic? Thanks once again.
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Old 08-01-2014, 10:32 AM   #2
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I experience it when try to run all three on the generator, or middle and rear unit on generator, and 30 amp service. I will run the front and rear unit to cool unit down faster then if needed just run the center A/C alone.
I have found each A/C draws about 15 to 18 amps.
I.e.: Center and rear A/C are on the same main breaker.
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Old 08-01-2014, 06:31 PM   #3
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Quote:
Originally Posted by 72mach View Post
The thermostat is showing an E7 which is a 120v error so has anyone experienced this on a Dometic? Thanks once again.
I got that error notice a couple of days ago. I was running on the generator. The circuit breaker had popped.
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Old 08-01-2014, 09:51 PM   #4
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If happening on generator maybe a spike of high voltage, or low voltage. I'm getting 117 volts at all electrical outlets when generator is running. May want to check that?
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Old 08-02-2014, 03:20 AM   #5
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Originally Posted by Camper2b View Post
If happening on generator maybe a spike of high voltage, or low voltage. I'm getting 117 volts at all electrical outlets when generator is running. May want to check that?

Thanks for the idea but it was on shore power at an established RV park. We never have had an issue before. I powered down completely and pulled the 50 amp service plug to check for problems and there was not arcing or any other signs of wear. I'll try to climb up on the roof and pull the shroud to see if there is anything up top. We have been static for a few months so there shouldn't be any road damage from what I can tell.
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Old 08-04-2014, 12:51 AM   #6
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I climbed up on the roof today to take some measurements. I checked various points on the relay board like the 3 fan connectors and the capacitor and all of them had the 120v. The unit make a 'clicking' noise like it was trying to turn on but of course nothing happened. I'm getting feedback from zone 2 on the thermostat and it shows the compressor symbol while trying to turn on before giving up and flashing the E7 code.
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