NO a/c NO A/H

Topic: NO a/c NO A/H (Read 1943 times) previous topic - next topic

NO a/c NO A/H

October 04, 2021, 03:44:20 pm

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 #1 – October 04, 2021, 03:49:43 pm

This one? Comfort Control kaput

Re: NO a/c NO A/H

Reply #2 – October 04, 2021, 03:50:29 pm

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 – October 04, 2021, 04:20:05 pm

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 – October 04, 2021, 04:23:54 pm

Quote from: GleamB – October 04, 2021, 04:20:05 pm

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 – October 04, 2021, 04:25:30 pm

I just Googled the replacement. Which model? They seem a little costly...

?!!!!!$250??

Re: NO a/c NO A/H

Reply #6 – October 04, 2021, 04:26:02 pm

Quote from: GleamB – October 04, 2021, 04:20:05 pm

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 – October 04, 2021, 04:27:06 pm

Quote from: GleamB – October 04, 2021, 04:25:30 pm

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

The model I have is: EasyTouch RV 357

Re: NO a/c NO A/H

Reply #8 – October 04, 2021, 05:17:07 pm

Quote from: Elliott – October 04, 2021, 04:27:06 pm

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

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 – October 04, 2021, 05:32:42 pm

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 – October 04, 2021, 05:55:00 pm

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 – October 04, 2021, 06:21:35 pm

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 – October 04, 2021, 06:32:23 pm

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 #13 – October 04, 2021, 07:34:37 pm

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.

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Re: NO a/c NO A/H

Reply #14 – October 04, 2021, 07:59:26 pm

Quote from: Jason – October 04, 2021, 07:34:37 pm

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.

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Re: NO a/c NO A/H

Reply #15 – October 05, 2021, 07:12:21 am

Quote from: GleamB – October 04, 2021, 05:55:00 pm

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 – October 05, 2021, 08:35:05 am

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 – October 05, 2021, 08:50:47 am

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 – October 05, 2021, 08:52:54 am

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 – October 05, 2021, 01:54:39 pm

Quote from: Roger & Susan in Home2 – October 05, 2021, 08:50:47 am

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.

Re: NO a/c NO A/H

Reply #20 – October 05, 2021, 07:15:15 pm

Quote from: juicesqueezer – October 05, 2021, 08:52:54 am

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!

This.

Re: NO a/c NO A/H

Reply #21 – January 15, 2022, 03:41:03 pm

As I mentioned above, this has been an intermittent problem....the WORST kind of problem.
I did order the VERY EXPENSIVE T-stat, as recommended.
I did NOT install it, as my original t-stat decided to light up and operate.......
Until today.
This problem seems to occur after the t-stat hasn't been used for a while, as in when it is in storage, or recently, not used for either the A/C nor heat. I don't know if that has any relevance.
So......I decided to install the plug and play Micro Air
No instructions came with this thing.
I plugged....
NO PLAY
It doesn't light up !!!!!!?

??
What is my next step? I wanted to test to see if the phone jack was getting power, but I only have standard tester.
Any help would be greatly appreciated

Re: NO a/c NO A/H

Reply #22 – January 15, 2022, 03:47:16 pm

If I recall correctly, it's require no set up to use at the screen. You should be able to plug that telephone cable in and start controlling things immediately. It makes me suspect your power source or a ground going to it. A loose ground may explain the symptoms you were seeing with the old T stat.

Re: NO a/c NO A/H

Reply #23 – January 15, 2022, 04:09:36 pm

Any ideas as to how to trace it?
This isn't my strong suit

Re: NO a/c NO A/H

Reply #24 – January 15, 2022, 04:12:29 pm

I agree with Elliot, it should be "plug and play". If you you want remote controlling, that's another story, ie, Bluetooth, Wi-Fi.

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