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Old 03-29-2023, 07:37 PM   #1
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Fleetwood Atwood Furnace Not Working

Hello Forum,

My 13 Fleetwood Storm has the Atwood furnace. I can’t recall the last time I used it. But need it to work now and when I turn the tstat to heat the fan comes on for less than a minute or so and then shuts off. I removed the exterior panel on the furnace and it has a light that flashes the fault code. It appears to be 1 flash every 3 seconds which means “Limit switch/Airflow”

So my question is can I do anything myself to fix this? The exhaust on the exterior was blowing air and the interior heat registers were blowing air during the attempted start ups. I suspect a mouse house may be blocking something since I never use the heat but don’t know where to look.

Any input is appreciated.
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Old 03-29-2023, 07:53 PM   #2
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The furnace has a "sail-switch" that detects air flow, if air flow does not meet minimum requirements, it will not allow the gas regulator to open.
The appliance expert here is Old-Biscuit. Ask a moderator to move this thread to the RV appliances forum for more exposure.
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Old 03-29-2023, 08:29 PM   #3
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As Ray mentioned...Sail Switch
It is a small switch with a 'paddle' that sticks out into the room air flow

When motor comes up to 75% speed there should be enough airflow to move the paddle and close the sail switch

Small white box accessible with exterior panel removed then remove cover over motor (4 screws)
Sail Switch will have a Blue wire (DC+ to Switch) and a White wire (DC+ FROM switch to connector on circuit board)

Many times the switch is just dirty ....stuff builds up under paddle where it makes contact with switch

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