AC won't turn back on

Hi pspc271, Did you get your problem fixed?

pspc271 wrote:

dougrainer wrote:

pspc271 wrote:
It's a dometic 12.5 ton AC with a dometic digital thermostat. The camper has 2 air conditioners each with a separate tstat. the front AC is a 15 the back which is acting up is the 12.5. Actually they were both doing the same thing at first. I opened up the front one and it seemed like the foam that was supposed to separate the cold air from the return wasn't wasn't sealed off. After I sealed it off better that unit has functioned properly. I did the same on the rear ac unit but it didn't change anything.

They don't make a 12.5 TON unit. If they did, your roof would collapse:B They make a 13.5k and a 15k. You need to verify that the Freeze Thermister is indeed installed in the coils and the cold air output is not hitting the wall tstat. Doug

Ok you got me, haha. But what exactly is a Freeze Thermister and where would I find it?

The freeze Thermister is installed in the Evap fins. It is about 1 inch long on a white wire. Doug

dougrainer wrote:

pspc271 wrote:
It's a dometic 12.5 ton AC with a dometic digital thermostat. The camper has 2 air conditioners each with a separate tstat. the front AC is a 15 the back which is acting up is the 12.5. Actually they were both doing the same thing at first. I opened up the front one and it seemed like the foam that was supposed to separate the cold air from the return wasn't wasn't sealed off. After I sealed it off better that unit has functioned properly. I did the same on the rear ac unit but it didn't change anything.

They don't make a 12.5 TON unit. If they did, your roof would collapse:B They make a 13.5k and a 15k. You need to verify that the Freeze Thermister is indeed installed in the coils and the cold air output is not hitting the wall tstat. Doug

Ok you got me, haha. But what exactly is a Freeze Thermister and where would I find it?

pspc271 wrote:
It's a dometic 12.5 ton AC with a dometic digital thermostat. The camper has 2 air conditioners each with a separate tstat. the front AC is a 15 the back which is acting up is the 12.5. Actually they were both doing the same thing at first. I opened up the front one and it seemed like the foam that was supposed to separate the cold air from the return wasn't wasn't sealed off. After I sealed it off better that unit has functioned properly. I did the same on the rear ac unit but it didn't change anything.

They don't make a 12.5 TON unit. If they did, your roof would collapse:B They make a 13.5k and a 15k. You need to verify that the Freeze Thermister is indeed installed in the coils and the cold air output is not hitting the wall tstat. Doug

pspc271,

Will the rear air conditioner behave if it is run by itself?

It's a dometic 12.5 ton AC with a dometic digital thermostat. The camper has 2 air conditioners each with a separate tstat. the front AC is a 15 the back which is acting up is the 12.5. Actually they were both doing the same thing at first. I opened up the front one and it seemed like the foam that was supposed to separate the cold air from the return wasn't wasn't sealed off. After I sealed it off better that unit has functioned properly. I did the same on the rear ac unit but it didn't change anything.

Need a LOT more info.
1. Does each AC unit have a separate wall tstat?
2. Brand and model of AC unit
3. TYPE wall tstat of AC unit, There are different types each AC brand uses. Doug

If it is new, take it to the dealer for warranty repair.

You say it's a new trailer. Has it ever worked correctly?

The air conditioner(s) may have a "freeze-stat" that's not installed as it should be (stuck in the coil fins). When it stops the compressor to let the coil defrost, it's a signal there's something wrong. You have to cycle the thermostat to reset whatever safety device it was that stopped the compressor. Take the filter down and look up inside the air conditioner. If you can see the coil, see if there's anything like a coil of very small tubing hanging in there next to the coil. Also make sure the cool discharge air isn't able to take a shortcut back into the return air.

I have them set to auto. Its past 2 degrees difference in temp