AFSAD12 Heater Problem - Escape Trailer Owners Community

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Old 02-21-2016, 01:33 PM   #1
T&R
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AFSAD12 Heater Problem

Ever since I picked up my 21 on 9/11/15 the Atwood AFSAD12 heater has not worked properly. Initially I was having trouble with the standard thermostat as well but after getting that sorted out the heater still does not function all the time.

It'll come on once and produce heat without issue. But after the next call for heat the unit emits a faint buzzing/hum noise, the fan never comes on and the diagnostic LED blinks once every three seconds. Atwood documentation indicates this is a "Limit Switch/Airflow" problem.

Since the fan never comes on I'm thinking it's not an airflow problem (which would likely be caused by a sail switch problem) but it looks like the limit switch and sail switch are wired in series (see attached diagram) so I don't want to automatically rule out the sail switch.

Anybody know what purpose the limit switch serves and what type of switch it is? It looks like the wiring diagram shows the limit switch is normally closed (N.C.) and the sail switch is normally open (N.O.).

If the sail switch for some reason stays closed after one heat cycle will it prevent the fan from coming on again if it's closed when the heater starts another cycle?


Also I spoke with somebody at the fall NOG whom was having trouble with their new 21 AFSAD12 heater but I don't remember who it was. Their symptom sounded more like a sail switch issue as they were always getting fan but no ignition. I'd be interested in hearing more of their issue and/or how they ultimately got it resolved.
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Old 02-21-2016, 02:00 PM   #2
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The furnace would be under warranty.
I would take the trailer to an authorized service centre near you and have them fix it to maintain your warranty.
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Old 02-21-2016, 02:25 PM   #3
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The sail switch needs to be in the open position. At the end of a heating cycle the sail switch needs to return to the open position to reset the control board so the furnace can start another cycle.
If the sail switch sticks in the on position after a heating cycle the furnace control board will sense that the sail switch is in the wrong position (ON) and will not let the furnace start. This is a necessary safety procedure to insure that the furnace goes through its proper purge cycle before firing . On many heating devices there are redundant safeties such as dual temperature hi limits ,gas valves ,proof of air flow ,stack dampers ,to insure that no one safety switch is defective , and lead to a possible explosion or monoxide issues.
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Old 02-21-2016, 03:41 PM   #4
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We had another 21 at Quartzsite that had just picked up in late November and the Heater has never worked. I think we all looked at it and no clue. I recommended the fellow call it in to ETI and get it serviced if they can't figure it out over the phone.
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Old 02-21-2016, 03:48 PM   #5
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Old 06-19-2016, 06:07 PM   #6
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Official resolution to the problem was replacement of the ignition control board in the furnace.

Escape didn't have any furnace troubleshooting suggestions but were helpful with the thermostat.

I did inquire with Escape why they plumb the gas line directly across the front of the furnace making furnace removal difficult. Their response was "a certified Atwood furnace technician will know how to handle the situation". The tech that did the work complained of it and said he had to carefully bend the line out of the way and bend it back. That worried me as I'd think the line may either kink and/or create a weak point.

I was hoping bringing the issue to Escape's attention may make them think twice before continuing to route the line directly across the front of the furnace.
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Old 10-09-2017, 08:41 AM   #7
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It have a problem with my furnace on my 2015 21’ Escape.also. Fan turns on the igniter attempts to Ignite about 3 times then it shuts down.
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Old 10-09-2017, 10:47 AM   #8
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If you are sure you have gas, the stove lights, it may be the sail switch. I don't recall if they would light for a second then go out, or not light at all.
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Old 10-09-2017, 11:03 AM   #9
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No there is gas, I am thinking is is the sail switch also
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Old 10-09-2017, 11:17 AM   #10
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Can you see the ignition control board LED? If you look at the diagnostic codes on page 7 of the manual it may help with troubleshooting.

http://www.americanrvcompany.com/ass...l-Furnaces.pdf
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