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Old 10-01-2017, 07:34 AM   #1
coyotewind
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Keystone Impact 303 Furnace

Thermostat and Furnace just went out. Do not have the manual. Dometic DM2862RBFX. Fuse is good. Any thoughts on what I can check?
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Old 10-01-2017, 07:46 AM   #2
chuckster57
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DM2862RBFX is a Refrigerator and doesn't have anything to do with the thermostat or furnace.

When you say "went out" what is happening/ NOT happening?
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Old 10-01-2017, 07:52 AM   #3
coyotewind
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Keystone 303 Furnace

Opps! I will find the furnace model number.
Anyhow, I had my RV plugged into house 120. Had the furnace running to keep the RV warm during cold weather (been in the 30's this week). Went out to check the heat in the RV. Furnace was not running. Thermostat does not turn on when I press the button. Have full battery charge (dual batteries). Have full propane. Running generator right now. Disconnected the house electrical. With no manual, I have no idea where to start. Will see if I can find furnace model number. Thanks!
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Old 10-01-2017, 08:13 AM   #4
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Furnace model isn't important at this time. If the Thermostat is the LC D diplay Dometic three button there is a manual:

https://www.manualslib.com/manual/72...92.html#manual
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Old 10-01-2017, 08:31 AM   #5
coyotewind
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Its an Atwood AFMD35121.
Thanks, I will download the thermostat manual.
Appreciate it!
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Old 10-01-2017, 08:35 AM   #6
coyotewind
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Thermostat is a Airxcel. Looks like a cheaper version of the Dometic.
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Old 10-01-2017, 08:41 AM   #7
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Quote:
Originally Posted by coyotewind View Post
Thermostat is a Airxcel. Looks like a cheaper version of the Dometic.
Airxcel is not Dometioc. It's Coleman/Mach. here you go:

https://www.airxcel.com/coleman-mach...cument-library

some of those thermostats have a small glass fuse under the panel.
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Old 10-01-2017, 08:49 AM   #8
coyotewind
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Thanks, I will go check the fuse!
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Old 10-01-2017, 09:12 AM   #9
coyotewind
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fuse is a 0.2A/250V, voltmeter says ok.
replaced 15A furnace fuse and still nothing.
also pressed heater reset and that did nothing.
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Old 10-01-2017, 09:26 AM   #10
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Quote:
Originally Posted by coyotewind View Post
fuse is a 0.2A/250V, voltmeter says ok.
replaced 15A furnace fuse and still nothing.
also pressed heater reset and that did nothing.
It appears you understand basic wiring. Did you check to see if thermostat is able to sent a heat signal to the furnace? Another possibility is the cut out or limit switch within the furnace it's self is bad?
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Old 10-01-2017, 09:53 AM   #11
coyotewind
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I will check the power to the thermostat and see if it can send a signal to the furnace.
Where might the cut out switch be located. Don't have the furnace manual nor schematics.
thanks!
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Old 10-01-2017, 10:34 AM   #12
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Quote:
Originally Posted by coyotewind View Post
Its an Atwood AFMD35121.
Quote:
Originally Posted by coyotewind View Post
Don't have the furnace manual nor schematics.
thanks!
Google is everyone's friend most often. This is the closest PDF manual to your model I've located. http://www.americanrvcompany.com/***...m-Furnaces.pdf
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