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Old 08-07-2022, 02:26 PM   #1
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Thermostat not working on Fwd AC

22 XL
I knew I should have checked more than just to see the AC units produced both heat and cold. My forward AC, once turned on will not turn off. Rear AC unit is working perfectly and keeping at least one spot nice for my dog when I am out riding. Is this an easy fix? What is likely the problem?
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Old 08-07-2022, 06:57 PM   #2
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The A/C or the fan? Do you have the fan set to auto, low or high?
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Old 08-07-2022, 07:23 PM   #3
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If your forward thermostat is attached to an outside wall or equipment chase that is on the outside wall, then heat from the wall keeps the thermostat thinking is hotter than it actually is in the RV. If you raise the set point on just the front thermostat until it cuts off, you may see a 4-5 degree differential between the front and the rear thermostat.
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Old 08-07-2022, 09:29 PM   #4
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Then replace your thermostats with these from Micro-Air, then you can program a temperature offset to reflect an accurate indoor temperature compared to what the thermostat is reading and the unit will shut off at the desired temperature. Plus, they are Bluetooth and WiFi enabled and you can change settings from your phone. If you have the Firefly system that’s part is not an advantage.

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Old 08-07-2022, 10:07 PM   #5
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I asked to be on their Beta program last week!

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Originally Posted by MoJoe1003 View Post
Then replace your thermostats with these from Micro-Air, then you can program a temperature offset to reflect an accurate indoor temperature compared to what the thermostat is reading and the unit will shut off at the desired temperature. Plus, they are Bluetooth and WiFi enabled and you can change settings from your phone. If you have the Firefly system that’s part is not an advantage.

Attachment 277593
I want one of these for the FWD AC unit so I can turn it on while driving using my iPhone. They don't have one ready for the GE AC Heat Pump units but it will be here soon.
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Old 08-07-2022, 10:09 PM   #6
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We have a winner...found problem in the mirror

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The A/C or the fan? Do you have the fan set to auto, low or high?
Seems I had Fan/Auto in the back and Fan/On in the front. My bad. Thank you, you solved another one. I remember being in IT and often the problem was attached to the keyboard on a regular basis
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Old 08-07-2022, 10:22 PM   #7
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Quote:
Originally Posted by MoJoe1003 View Post
Then replace your thermostats with these from Micro-Air, then you can program a temperature offset to reflect an accurate indoor temperature compared to what the thermostat is reading and the unit will shut off at the desired temperature. Plus, they are Bluetooth and WiFi enabled and you can change settings from your phone. If you have the Firefly system that’s part is not an advantage.

Attachment 277593


Waiting impatiently for these to replace the Atwoods. Thanks for letting us know about these, Joe.
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Old 08-08-2022, 05:20 AM   #8
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Originally Posted by twp5253 View Post
Seems I had Fan/Auto in the back and Fan/On in the front. My bad. Thank you, you solved another one. I remember being in IT and often the problem was attached to the keyboard on a regular basis
Back in the day we used to call it a I/O error. Could stand for Input/Output but also for I***t Operator.
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Old 08-09-2022, 10:09 AM   #9
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So...

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Originally Posted by MoJoe1003 View Post
Then replace your thermostats with these from Micro-Air, then you can program a temperature offset to reflect an accurate indoor temperature compared to what the thermostat is reading and the unit will shut off at the desired temperature. Plus, they are Bluetooth and WiFi enabled and you can change settings from your phone. If you have the Firefly system that’s part is not an advantage.

Attachment 277593
So it's 90 outside and when you set the room to 70 it doesn't cut off until the actual room temperature is 65. So you program a 5 degree offset, right?

And the next day a cold front comes through, and the thermostat is set at 70 but the room only cools to 75 and you are warm because the offset is still there, right?

offsetting the inside thermostat based on the varying outside ambient temperature makes no sense to me.
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Old 08-09-2022, 10:19 AM   #10
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It is referred to as PEBKAC!

Problem Exits Between Keyboard and Chair
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Old 08-09-2022, 10:49 AM   #11
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Quote:
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So it's 90 outside and when you set the room to 70 it doesn't cut off until the actual room temperature is 65. So you program a 5 degree offset, right?



And the next day a cold front comes through, and the thermostat is set at 70 but the room only cools to 75 and you are warm because the offset is still there, right?



offsetting the inside thermostat based on the varying outside ambient temperature makes no sense to me.


It is not setting an offset based on the outside ambient temperature. The offset is set based on the actual interior temperature. Based on location, the thermostat may indicate the interior temperature is 75 degrees when it may actually be 78, so if set to 75 degrees it will shut off and the interior of the coach is really 78. By setting a 3 degree offset the thermostat shuts off at the room temperature when it is actually 75. The reverse of this can also happen, of course. To accomplish the offset you must use a stand alone thermometer, somewhere closer to the center of the room, to determine actual room temperature vs. what the thermostat indicates it thinks it is. The standard thermostats in most of our coaches do not allow for this adjustment. The Micro-Air thermostats do.
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Old 08-09-2022, 11:07 AM   #12
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Well, yes, but...b

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It is not setting an offset based on the outside ambient temperature. The offset is set based on the actual interior temperature. Based on location, the thermostat may indicate the interior temperature is 75 degrees when it may actually be 78, so if set to 75 degrees it will shut off and the interior of the coach is really 78. By setting a 3 degree offset the thermostat shuts off at the room temperature when it is actually 75. The reverse of this can also happen, of course. To accomplish the offset you must use a stand alone thermometer, somewhere closer to the center of the room, to determine actual room temperature vs. what the thermostat indicates it thinks it is. The standard thermostats in most of our coaches do not allow for this adjustment. The Micro-Air thermostats do.
Well, yes, but if the REASON for the offset is that the thermostat is mounted on an exterior wall that affects the sensed temperature, then the offset will be dependent on the outside air temperature.

You are suggesting that the deviation is constant. In this case it is not.
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Old 08-09-2022, 11:13 AM   #13
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Not suggesting the deviation remains constant year-round or in all situations, angle of the coach relative to the sun can have a detrimental effect. All I know for sure is it works in my coach very well and if I need to change the offset a degree or two I can do it from my phone through the Bluetooth or WiFi capability of the Micro-Air thermostats.
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Old 08-09-2022, 11:16 AM   #14
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Another option is to add a spacer behind the thermostat and raise it about 1/4” from the wall. Insulate in the opening and reattach the thermostat.

Since this was done on my Isata 5, I no longer have issues with the front thermostat being different from the rear.
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