Intermittent furnace problem - Page 3

fastellman · 12-26-2021, 07:20 PM

Hatwate I also have a ‘16 Thor ACE 30.1 with a Honeywell digital that I installed. I have the same problem you are describing. It doesn’t happen every time the heater runs. Actually not very often. It’s like the heater isn’t listening to the thermostat. The system will be running fine and I will wake up in the middle of the night and find the temperature to be 60 when the thermostat is set for 70 and the thermostat thinks it’s asking for the heater to run. I have discovered that if I lower the set point to below the current temp it will stop asking the heater to run and then raise the set point back up the furnace will run. Usually that’s all it takes but sometimes I have to do that a couple of times before the temperature gets back to normal. The thermostat and the control board have both been replaced. I’m also stumped about what to do.

hatwate · 12-26-2021, 08:05 PM

Quote:

Originally Posted by fastellman

Hatwate I also have a ‘16 Thor ACE 30.1 with a Honeywell digital that I installed. I have the same problem you are describing. It doesn’t happen every time the heater runs. Actually not very often. It’s like the heater isn’t listening to the thermostat. The system will be running fine and I will wake up in the middle of the night and find the temperature to be 60 when the thermostat is set for 70 and the thermostat thinks it’s asking for the heater to run. I have discovered that if I lower the set point to below the current temp it will stop asking the heater to run and then raise the set point back up the furnace will run. Usually that’s all it takes but sometimes I have to do that a couple of times before the temperature gets back to normal. The thermostat and the control board have both been replaced. I’m also stumped about what to do.

Thank you! I was beginning to think I am the problem. I usually just turn it off and back on to get it to work but it sounds exactly like our problem. We have a Colman Mach thermostat so does that rule out the thermostat?

Scubawise · 12-26-2021, 11:00 PM

Quote:

Originally Posted by fastellman

Hatwate I also have a ‘16 Thor ACE 30.1 with a Honeywell digital that I installed. I have the same problem you are describing. It doesn’t happen every time the heater runs. Actually not very often. It’s like the heater isn’t listening to the thermostat. The system will be running fine and I will wake up in the middle of the night and find the temperature to be 60 when the thermostat is set for 70 and the thermostat thinks it’s asking for the heater to run. I have discovered that if I lower the set point to below the current temp it will stop asking the heater to run and then raise the set point back up the furnace will run. Usually that’s all it takes but sometimes I have to do that a couple of times before the temperature gets back to normal. The thermostat and the control board have both been replaced. I’m also stumped about what to do.

Our bmpro temp was off. Did software update fix.

hatwate · 12-27-2021, 12:11 AM

Quote:

Originally Posted by Scubawise

Our bmpro temp was off. Did software update fix.

I have no idea what that is. Can u help me understand. Does every ace 30.1 have one?

**16ACE27** · 12-27-2021, 12:20 AM

Quote:

Originally Posted by hatwate

I have no idea what that is. Can u help me understand. Does every ace 30.1 have one?

Doesn't apply to your MH.

Jeepman1 · 01-10-2022, 04:57 PM

I am having basically the same issue. I have replaced the circuit board. Didn’t help.
Heater works great as long as the blower is running. I can hear a click coming from the thermostat
Once the temp is reached and the blower shuts off the heater won’t come back on regardless of the room temp unless I manually turn it from heat to off then back to heat, slide the slider all the way off and back on, or use the reset switch. Once the blower goes off I don’t hear and clicks from the thermostat until I reset
Then the heater will work fine until the temp is reached and the blower shuts off

Sure hope we can find the issue. Thanks

hatwate · 01-10-2022, 05:20 PM

I’ll post whenever we get it figured out. Problem is that it is intermittent. For example it has worked fine for the past 3-4 days.

Bill Johnson · 01-10-2022, 05:24 PM

Quote:

Originally Posted by hatwate

I’ll post whenever we get it figured out. Problem is that it is intermittent. For example it has worked fine for the past 3-4 days.

My guess is the thermostat it works fine until it doesn't the only thing your touching is the thermostat

Jeepman1 · 01-10-2022, 05:41 PM

Quote:

Originally Posted by Bill Johnson

My guess is the thermostat it works fine until it doesn't the only thing your touching is the thermostat

I’ve thought about the thermostat but I can use the reset switch on the outside and it will work without touching the thermostat. (I’m not saying that isn’t the problem)
Thanks

Bill Johnson · 01-10-2022, 05:53 PM

Quote:

Originally Posted by Jeepman1

I’ve thought about the thermostat but I can use the reset switch on the outside and it will work without touching the thermostat. (I’m not saying that isn’t the problem)
Thanks

Is this a new thermostat? if it is I would put in the old one and see if it makes a difference

abjbrtd · 01-10-2022, 06:01 PM

Quote:

Originally Posted by Bill Johnson

My guess is the thermostat it works fine until it doesn't the only thing your touching is the thermostat

We have the same problem, runs once, shuts off doesn't restart BUT we hve this thermostat.

It's been working OK since I took the cover

off to get the part #..
I put it back on once failed after 1 run

Bill Johnson · 01-10-2022, 06:31 PM

Quote:

Originally Posted by abjbrtd

We have the same problem, runs once, shuts off doesn't restart BUT we hve this thermostat.

It's been working OK since I took the cover

off to get the part #..
I put it back on once failed after 1 run

I thought about getting a digital thermostat for mine but I'm waiting to see what the problem is

Bill Johnson · 01-10-2022, 06:36 PM

Quote:

Originally Posted by abjbrtd

We have the same problem, runs once, shuts off doesn't restart BUT we hve this thermostat.

It's been working OK since I took the cover

off to get the part #..
I put it back on once failed after 1 run

Did you try wiggling the wires while its running to see if anything is loose or the wire has a break in it

Jeepman1 · 01-10-2022, 07:31 PM

It’s the same thermostat that came with the Rv in 2020. I did wiggle the wires too

Bill Johnson · 01-10-2022, 08:58 PM

Quote:

Originally Posted by Jeepman1

It’s the same thermostat that came with the Rv in 2020. I did wiggle the wires too

Boy, I don't have any other ideas, hopefully someone here will come up with something

Bill Johnson · 01-10-2022, 11:54 PM

Quote:

Originally Posted by abjbrtd

We have the same problem, runs once, shuts off doesn't restart BUT we hve this thermostat.

It's been working OK since I took the cover

off to get the part #..
I put it back on once failed after 1 run

I have an Idea if the heater isn't turning on go check down at the furnace and see if the thermostat is providing power to the two wires at the furnace. If there isn't 12 volts at the furnace it's the Thermostat. If there is 12 volts at the furnace it's something at the board

Jeepman1 · 01-11-2022, 04:18 AM

Quote:

Originally Posted by Bill Johnson

I have an Idea if the heater isn't turning on go check down at the furnace and see if the thermostat is providing power to the two wires at the furnace. If there isn't 12 volts at the furnace it's the Thermostat. If there is 12 volts at the furnace it's something at the board

Any idea what wires to test at the furnace for the thermostat ? Can’t find a wiring diagram.

@ Hatwate, don’t mean to hack your thread. Hope you don’t mind.

**16ACE27** · 01-11-2022, 04:46 AM

Quote:

Originally Posted by Jeepman1

Any idea what wires to test at the furnace for the thermostat ? Can’t find a wiring diagram.

@ Hatwate, don’t mean to hack your thread. Hope you don’t mind.

Did you look in the manual? The schematic for the Atwood furnaces is well documented.

Jeepman1 · 01-11-2022, 05:15 AM

I have a manual but not that one. Mine doesn’t show any wiring. Thanks

Jeepman1 · 01-11-2022, 04:59 PM

Quote:

Originally Posted by Jeepman1

I have a manual but not that one. Mine doesn’t show any wiring. Thanks

Quote:

Originally Posted by hatwate

We have a 2016 ACE 30.1. Our furnace will run fine for several hours then stop producing heat (actual temperature displayed at thermostat drops below setting on thermostat). Even turning up the thermostat does not restart the heat it makes no attempt to start. When we turn it off & back on (off/on on thermostat), it begins producing heat again just fine. Over the past year we have had all the possible culprits replaced and it has been impossible to produce it with the repair person on site. Thi started when we switched from analog to digital and I believe we have replaced it once since. Any thoughts?

This has been edited to reflect questions asked by responders

Which furnace do you have? Mine is Dometic DFMD30.
I think they are all basically the same. Hope we get this figured out soon.
Thanks

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