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Topic: NO a/c NO A/H (Read 2223 times) previous topic - next topic

NO a/c NO A/H

I think I posted this issue around last May. I just tried to search for the post, to update it, but couldn't find it.
Is there a way to review my past posts?

More importantly.....My Comfort Control doesn't light up when I move the switch to "on". This has happened a few times, now. I think I asked where the t-stat got its power from, but, again, didn't find that topic. I disconnected the phone looking connections in both front and back a/c units, sprayed them with contact cleaner, and worked them in and out. This SEEMED to help the last few times, but not today.

We are packing the coach up for our yearly trip to Mexico, so heating and cooling that works would be a real nice thing to have working properly.

Any suggestions of how to track down the problem?
Thanks

Re: NO a/c NO A/H

Reply #2 –
Have you tried a different T-Stat? I have a known working one I can loan you.

Otherwise a few of us have converted over to this plug & play upgrade: EasyTouch RV™ Thermostat – Micro-Air, Inc.

Re: NO a/c NO A/H

Reply #3 –
Elliot,

Does the replacement t-stat use the same phone jack that goes into the back of the Comfort Control.
I'm only here, in Maine, until the 14th, then on the road. I could have you send it to my brother-in-law in Texas. I think I'll look into buying the new upgrade, if you think that could fix the problem. Is there a test to see if I'm getting current to the t-stat?

And thanks for finding my previous post!! Nice work

Re: NO a/c NO A/H

Reply #4 –
Quote from: GleamB –
Elliot,

Does the replacement t-stat use the same phone jack that goes into the back of the Comfort Control.
I'm only here, in Maine, until the 14th, then on the road. I could have you send it to my brother-in-law in Texas. I think I'll look into buying the new upgrade, if you think that could fix the problem. Is there a test to see if I'm getting current to the t-stat?


Yes

12 power comes from a breaker that is in compartment behind white cover.  At one time I had to  disconnect the wire so I could reset the system.

Re: NO a/c NO A/H

Reply #5 –
I just Googled the replacement. Which model? They seem a little costly...????!!!!!$250??

Re: NO a/c NO A/H

Reply #6 –
Quote from: GleamB –
Elliot,

Does the replacement t-stat use the same phone jack that goes into the back of the Comfort Control.
Yup, it's a direct fit for the 5-button comfort control. It is NOT plug and play with the 4-button unit though, there's more work involved in that scenario.

WiFi/Bluetooth thermostat upgrade from Dometic 5-button

Re: NO a/c NO A/H

Reply #7 –
Quote from: GleamB –
I just Googled the replacement. Which model? They seem a little costly...????!!!!!$250??

You're paying for the ability to control it from your phone. It's pretty slick when you're laying in bed and want to turn the heat on at night  ^.^d

The model I have is: EasyTouch RV 357

Re: NO a/c NO A/H

Reply #8 –
Quote from: Elliott –
You're paying for the ability to control it from your phone. It's pretty slick when you're laying in bed and want to turn the heat on at night  ^.^d

The model I have is: EasyTouch RV 357


You can also set it with a high and low temps.  Temp get too high, AC turns off.  temp get to low, heat come on.

Only want the heat to come on say 7AM?,  just set a schedule for the heat to turn on at 7AM and pick the temp you want it to go up to.

If you have it connected to an internet connection you can check or change the temps from anywhere.

Re: NO a/c NO A/H

Reply #9 –
I have the four button T-stat so yours may be different problem

The solder joint connecting the on/off switch to the board had cracked on mine.  I had intermittent problems and finally it totally quit.

Try wiggling the switch to see if it tries to come on.  If yes, it may be solder joint.

Re: NO a/c NO A/H

Reply #10 –


12 power comes from a breaker that is in compartment behind white cover.  At one time I had to  disconnect the wire so I could reset the system.


Sorry.....compartment behind WHAT white cover?? The T-stat? How did you reset the system?

Re: NO a/c NO A/H

Reply #11 –
I have the same unit that Elliott mentioned, #357.  If you have the 5-button Dometic controller now, it's a direct, plug-and-play replacement.  If it's the controller that's the problem, this should resolve that issue, plus give you a lot of nice added features like scheduling and remote access like Turbojack mentioned.

Re: NO a/c NO A/H

Reply #12 –
Sounds great.
I just would like to be certain:

A) I have power to the existing t-stat. I will TRY and check the red/black wires tomorrow

B) It isn't simply the 3 v  fuses. I had the units running about a month ago, so I think its NOT that.

I will order one tomorrow.

Re: NO a/c NO A/H

Reply #14 –
Quote from: Jason –
This is what is in mine Amazon.com: Dometic 3314082011 Appliance Components Rv : Automotive  Works fine for the dual ACs. I don't have AH though, just a meager 295.
Same one that came in my coach when we bought it. Has AH setting too.
As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: NO a/c NO A/H

Reply #15 –
Quote from: GleamB –

12 power comes from a breaker that is in compartment behind white cover.  At one time I had to  disconnect the wire so I could reset the system.


Sorry.....compartment behind WHAT white cover?? The T-stat? How did you reset the system?


In one of your lower compartments (drivers side?) there is a white cover that is held on with thumb screws, that is over all of the circuit breakers.  I had to find the correct one and remove  the nut to get the wire off to kill the power to the thermostats and system.

Re: NO a/c NO A/H

Reply #16 –
Yesterday, the t-stat would not light up, when I moved the switch from off to on.
As I mentioned, this has occurred a few times, since last May.
I left the unit " on ", overnight. This morning, as I walked by the coach, I heard the sound of the a/c running. Went inside.....yup....
t-stat was lit up and a/c on. Soooooo.......any ideas???
I HATE  intermittent problems, like this!!!!

Re: NO a/c NO A/H

Reply #17 –
Intermittent means it will work when it doesn't matter and not work when it is critical.  Almost always.

Check all all of the phone cable connections. From the rear AC to then front AC  and at the back of the thermostat. Lots of couplers and connections.  12v to the thermostat comes from the ACs. If the thermostat works some times and seems dead others power is where I would start.  It could be a cable, a connector, a circuit board or maybe the thermostat. A new 10 button thermostat replacing a 5 button thermostat may not be a direct plug and play. Some have gad to change boards in the ACs but thos might have been 4 to 10 swaps. 

Re: NO a/c NO A/H

Reply #18 –
Glenn, it sounds like you need to replace the thermostat.  Boards to go out or have loose connections over time.  Good luck with your issue!

Re: NO a/c NO A/H

Reply #19 –
Quote from: Roger & Susan in Home2 –

 12v to the thermostat comes from the ACs.

The AC is getting the 12V from the coach's 12V system.  If you were to loose your 12V power from the coach's 12v system, and still had 110v to the AC the AC would not work.  They need the 12V from the coach to be able to work.