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Old 06-30-2020, 09:02 PM   #1
z28
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Brand: Thor Motor Coach
Model: ACE 30.3
State: Florida
Posts: 50
THOR #9536
Oman shuts off but will restart

I have an o an generator 4000 in my 2018 ACE. This past weekend after running the A/C for anywhere from 30 minutes to 3 hours the generator would shut off, however it would always restart immediately. I found that it appeared that the generator was at times going under a load making the generator shut off. If I was able to catch the generator before it stalled and turned the A/C off I could keep the generator running. The unit cools well as long as it keeps running. I will say the outside temp was in the low 90 degree range. The generator was service by CW this past March with new fuel and air filters. But whatís got me stumped is that when it shuts off it will always restart immediately. Thanks in advance for any help
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Old 06-30-2020, 09:18 PM   #2
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THOR #6411
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I have an o an generator 4000 in my 2018 ACE. This past weekend after running the A/C for anywhere from 30 minutes to 3 hours the generator would shut off, however it would always restart immediately. I found that it appeared that the generator was at times going under a load making the generator shut off. If I was able to catch the generator before it stalled and turned the A/C off I could keep the generator running. The unit cools well as long as it keeps running. I will say the outside temp was in the low 90 degree range. The generator was service by CW this past March with new fuel and air filters. But whatís got me stumped is that when it shuts off it will always restart immediately. Thanks in advance for any help
Sounds like the A/C is cycling in hot weather and not pausing long enough for the A/C pressure to bleed down (4 to 6 minutes). A/C compressors have a stalled current rating of about 45 amps. This will certainly stall the 4000 which has a max output of 33 amps.
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Old 06-30-2020, 09:24 PM   #3
z28
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THOR #9536
Thanks for the reply, so what can be done about this? is it a parts issue or an A/C over or under charge issue?

thanks
Mark
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Old 06-30-2020, 10:34 PM   #4
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THOR #2631
Check the manual for your wall thermostat. Many digital thermostats have a built in time delay on call for cooling to prevent the compressor short cycling and potentially tripping breakers.
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Old 06-30-2020, 11:04 PM   #5
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THOR #6411
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Originally Posted by z28 View Post
Thanks for the reply, so what can be done about this? is it a parts issue or an A/C over or under charge issue?

thanks
Mark
The A/C control board (what the thermostat communicates with in the A/C) controls the min cycle time. If it is changeable on a mach 3 or 15 is unknown to me. If you leave the fan on continuous and not auto, it might help but it s not a cure. I used to have a coach with the original 1969 10,000 btu Coleman mach. It was forever stalling my Generac 4000 genset when traveling. The cure for the stalling was a new 2004 Coleman mach 3 PS on the roof.
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Old 07-01-2020, 01:00 PM   #6
z28
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THOR #9536
Thanks for your reply, the issue I am having is very random, sometimes the A/C can run for any where from 2-3 hours before I hearthe generator going on a load and shutting off , another time using the A/C it shut the generator off after a few minutes. The generator would always restart immediately in all cases. In all cases I always keep the thermostat at the highest temp setting that allows the A/C to turn on. So with that being said I donít believe I have a thermostat or control panel issues but maybe a high head pressure causing the generator to be placed under load. Hoping someone has had the same experience.
Thanks
Mark
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Old 07-01-2020, 02:17 PM   #7
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THOR #7035
Is your water heater on AC or gas. That may be adding to the problem.
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Old 07-01-2020, 02:46 PM   #8
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Does your 2018 ACE have an analog or digital thermostat? I suspect (but donít know) that Analog thermostats do not prevent short cycling the A/C unit compressor, so unless the A/C has its own circuitry to do that, there may be times during very hot weather when the A/C compressor comes on again too soon after just finishing a previous cooling cycle (as Beau388 was originally suggesting). This causes a high AC load current spike that we suspect is causing your gen to stall. I replaced the analog thermostat that came with my 2013 ACE many years ago with a cheap Hunter digital unit which is equipped with a built in 4 minute delay when calling for cooling. So this means that after the compressor operates for a cooling cycle and then shuts off, when the thermo calls for cooling again (could be very quickly in hot weather) there will be an additional time delay before the thermostat actually signals the A/C compressor relay unit in the ceiling to operate again.


The other interesting thing would be to refer to your generator manual for the procedure to see if the generator has created codes for why it shut down. It may turn out that there is something else causing a load response problem. The other thing to consider is what other loads are on when the generator stops under load......batteries also taking high charge currents via the converter; and any inverter loading, for example?
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Old 07-01-2020, 07:48 PM   #9
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Hope this isn't a stupid question. Are you sure it is electrical related? I used to have our generator shut down after being on for awhile. I found that it would shut down if the oil was filled just slightly above the upper fill line. I now make sure it is in the middle and it's worked fine for several years.

Good luck and safe travels.
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