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Old 07-18-2019, 09:20 PM   #1
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Rockwood 5th Wheel - both air conditioners shut down

Any clues why both roof a/c’s suddenly stopped working/shut down simultaneously?

On shore power, 50 amps. Circuit breakers did not trip. Have 120vac to all other functions.

Is there another 120vac cut off device / current trip somewhere in the system?

I checked shore power and it is good. All outlets and other 120 vac appliances work (fridge, microwave, lamps). Both thermostats indicate “cool” and have fresh batteries.

The 2 a/c units just stopped working - silent.

Ideas?
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Old 07-18-2019, 10:57 PM   #2
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My only response would be a flipped breaker. I would flip all off wait then flip all back on.
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Old 07-19-2019, 05:49 AM   #3
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Low voltage can cause the thermal protection inside the motors to open due to the heat generated by the higher current draw.

Check the voltage being delivered to the camper.
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Old 07-19-2019, 06:04 AM   #4
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You say you "checked" the shore power and "it's good". Did you actually use a multi-meter to see what voltage is present at the pedestal?

You didn't say where you are camping. Is it part of the "heat dome" that has overtaken much of the country? If so, it likely could be just too much strain from too many A/C units in the RV park.
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Old 07-19-2019, 06:51 AM   #5
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Thanks for replies. Actually, we are camping at our home while workers renovate and repair our house. We are connected to our home’s power. The voltage is steady. I am baffled but ASSUME the problem must be inside the RV power distribution. But I certainly may be wrong because I know next to nothing about these RV sealed throwaway a/c units.

But both units go “silent”? Put fresh batteries in thermostats. Thermostats have been in use for 3 years, so they are compatible.

At house main panel, I pulled 50amp breaker and reset it. No change.

At thermostat I switched “on” each a/c fan, so fans should run without compressors, but fan is silent. Looks like no 110vac power gets to either a/c units. Will recheck breakers.

Frustrating!
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Old 07-19-2019, 08:12 AM   #6
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wow!

my initial thought was something in common between the two a/c's like a common thermostat. but you mentioned thermostats (plural) so i'm assuming each a/c and thermostat is independent. low voltage was mentioned as a cause of a thermal shutdown but that would be independent for each a/c motor. the fact that they shut down simultaneously says that is not the problem. it has to be something in common between the two. they should both be one their own leg of the incoming 50 amp power and they should both have their own separate branch circuit breaker.
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Old 07-19-2019, 08:19 AM   #7
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Most of the AC units use 12 VDC to run the control circuits, make sure the 12 VDC is good as well. It’s very unlikely that both system would fail simultaneously.
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Old 07-19-2019, 10:46 AM   #8
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Check the 12VDC fuse to your furnace.

Most AC units (Dometic excluded) receive start power from the T-stat. The T-stat is actually just a switch. It simply turns positive (+12VDC) power on and off and the T-stat actually receives this power (+12VDC) from the furnace circuits fuse.

Dometic AC's are different beasts; their T-stats switch the ground side instead of the positive side, so the +12VDC is coming from the AC somehow; if that's what you have, troubleshooting will get more involved.

If you don't have a Dometic, and if your T-stats have the option to turn on the AC fan continuously, try that. If the fan won't run, you probably don't have +12VDC to the T-stat.

If you don't have a Dometic, you can simply take the T-stat off the wall and, using a paperclip, short the R/RC terminal to the Y terminal. This should start the compressor. Only do this for a few seconds. You can also try shorting R/RC to the GL (fan low) or GW (fan high) terminals (or just G if you don't have GL and GW). This should also start the fan.
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Old 07-19-2019, 10:54 AM   #9
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Quote:
Originally Posted by RFKosar View Post
Thanks for replies. Actually, we are camping at our home while workers renovate and repair our house. We are connected to our home’s power. The voltage is steady. I am baffled but ASSUME the problem must be inside the RV power distribution. But I certainly may be wrong because I know next to nothing about these RV sealed throwaway a/c units.

But both units go “silent”? Put fresh batteries in thermostats. Thermostats have been in use for 3 years, so they are compatible.

At house main panel, I pulled 50amp breaker and reset it. No change.

At thermostat I switched “on” each a/c fan, so fans should run without compressors, but fan is silent. Looks like no 110vac power gets to either a/c units. Will recheck breakers.

Frustrating!
How are you connected to your home's power?

It would be quite unusual for BOTH A/C units to quit at exactly the smae time.

You are going to need to do some voltage checks and report back.

Start with where you are plugged in and go towards the R/V checking all connections and wiring.
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Old 07-19-2019, 11:04 AM   #10
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How are you connected to your home's power?

It would be quite unusual for BOTH A/C units to quit at exactly the smae time.

You are going to need to do some voltage checks and report back.

Start with where you are plugged in and go towards the R/V checking all connections and wiring.
OP stated he had 120VAC to all other functions (post #1).
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Old 07-19-2019, 11:11 AM   #11
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I'm going to agree with Rockfordroo. Start checking the 12 volt side. While the 120 volt sides should be independent I bet the 12 volt power comes from the same place and most likely the same fuse.
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Old 07-19-2019, 02:12 PM   #12
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I was troubleshooting the same situation on a friends camper one time. The furnace was next to the storage area and someone or something hit a wire on the furnace and broke it. Turned out the 12VDC went from the fuse panel to the furnace and then to the AC. The broken wire...you guessed it...it went to the AC.
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Old 07-23-2019, 12:36 PM   #13
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If its a dometic a/c there naff, how the company is still in business I don't know, all Chinese rubbish
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