atwood furnace problem - Dutchmen Owners

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Old 10-23-2017, 05:58 PM   #1
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atwood furnace problem

We have a 2016 coleman 2855 with an atwood furnace. We had no problems in april and this past weekend was the first time we have tried to use it since then. No luck. The red diode would blink once then 3 second pause. The blower will not even try to start. I looked at the ignition control board and it looks like there could have been some water on it. there was some dried rusty powder on top and bottom. any thoughts would be appreciated.
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Old 10-23-2017, 06:39 PM   #2
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Had a similar issue with mine last year. I could take the outside cover off... hit the blower motor with the heel of my hand a couple of times, and it would finally come on. Of course, as soon as it warmed up & turned off... same issue when it cooled back down again. I looked all around, tried blowing any trash out with my compressed air hose... nada.

Finally got a tech to look at it, and he found the issue within 2 minutes. Removed the blower motor shroud, and showed me that a contact which was attached to the inner part of it (called a Sail Switch), and that it was sticking. As soon as he tapped it with a small screwdriver, it made contact, and the unit began running. Replaced that, no further issues. $12 of the part, and 5 minutes to replace it.
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Old 10-23-2017, 07:18 PM   #3
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The sail switch could be stuck as Tom suggested or it could be an air flow problem. Meaning, not enough air getting to the blower motor to activate the sail switch. Perhaps a mouse has built a home in the intake air duct or something is covering the air intake.

However, with the blower not being able to activate I'd say the sail switch is out of the equation. Rusty powder on the control board might be the problem. Water could have shorted or grounded some of the components or the limit switch might have corroded terminals.

http://bryantrv.com/docs2/docs/hflamefurn04.pdf
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Old 10-23-2017, 07:21 PM   #4
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the board is what im leaning towards but figured i would check with others. the camper is still under warranty from camping world but it will cost me as much to drive it there as it would for me to buy the part and do it myself.
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Old 10-23-2017, 07:28 PM   #5
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Quote:
Originally Posted by jhlapinski View Post
the board is what im leaning towards but figured i would check with others. the camper is still under warranty from camping world but it will cost me as much to drive it there as it would for me to buy the part and do it myself.
Can you post a photo of the board? Also it is imperative to find out how the water got in there.
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Old 10-23-2017, 09:21 PM   #6
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Even if it's not the problem now, cover those outside vents with a bug screen, perfect size for mud dauber and wasp nests.
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Old 10-23-2017, 10:54 PM   #7
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i cannot post a pic at the moment. I am looking for a surefire way to test the board. It has power to it. no power going to the blower. I want to check the sail switch and the limit switch to make sure they are ok but I am still 95% sure its the board.
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Old 10-23-2017, 10:54 PM   #8
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Good plan
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Old 10-23-2017, 11:38 PM   #9
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Quote:
Originally Posted by jhlapinski View Post
i cannot post a pic at the moment. I am looking for a surefire way to test the board. It has power to it. no power going to the blower. I want to check the sail switch and the limit switch to make sure they are ok but I am still 95% sure its the board.
You might try to brush the gunk off the board with a toothbrush and a little alcohol. Blow the board dry and give it a test.
One of the flow charts shows the power going to the motor comes from the relay. That relay may be on the board or separate.

The link I provided gives the flow chart and sequence of operation. Power to the board flows through the limit switch and sail switch so they can be thought to be ok before you tear into it. That leaves the relay to power the blower motor as suspect.
I don't know which furnace you have but the sequence should be the same, however the flow chart may be a little different.
The model number of the furnace will help us with this problem.
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Old 10-24-2017, 11:41 AM   #10
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thanks. Model : afmd 30111
I should be able to check switches today when i get home from work.
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