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Old 09-04-2017, 06:12 PM   #1
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Wanna know when your furnace is going to quit?

When the temps outside dip into the low 30's and you're boondocking w/out electric.


Atwood AFMD30111 - one light every three seconds means "air flow / high limit".

If it's air flow - then it's a new problem because this is season 2 and we used the furnace in March of this year.


No attempt at a spark/ignition.
The blower just runs for 20 seconds then shuts down.

Grrrrrrrrrrrrrrrrrr.
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Old 09-04-2017, 06:47 PM   #2
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Sounds like bugs or mice.
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Old 09-04-2017, 07:44 PM   #3
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Or low bat voltage, fan's not spinning fast enough.
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Old 09-04-2017, 09:15 PM   #4
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I had this happen to me once in my TT. Called the best RV tech I know who explained it was dust on the air sensor. Furnace thinks there is no flow. He to me to smack it (really smack it). Hard to believe but that worked!
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Old 09-04-2017, 09:32 PM   #5
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Like was previously mentioned, the sail switch isn't getting closed. The sail switch is part of the circuit in the furnace that determines if air flow sufficient. Check your registers for shoes/slippers or some other critters.
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Old 09-05-2017, 09:22 PM   #6
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Quote:
Originally Posted by pconroy View Post
When the temps outside dip into the low 30's and you're boondocking w/out electric.


Atwood AFMD30111 - one light every three seconds means "air flow / high limit".

If it's air flow - then it's a new problem because this is season 2 and we used the furnace in March of this year.


No attempt at a spark/ignition.
The blower just runs for 20 seconds then shuts down.

Grrrrrrrrrrrrrrrrrr.
Just dealt with this recently. After resetting if there is no attempt at ignition, then it's either the sail switch or low voltage. I'll bet on voltage. My problem was low voltage, caused by a faulty battery. The fan sounded normal, but was not getting up to speed in order to close the sail switch. Check your house battery!
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Old 09-05-2017, 09:32 PM   #7
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Thanks for the suggestions. It was also happening, the next morning, when running the generator so I was thinking low voltage would not be an problem.

Wife also thinks the ducts might have been smushed a bit.

Anyway we have things to check!
Thank you all!
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Old 09-06-2017, 04:39 PM   #8
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Just got a response from Atwood (now Dometic) C.S. "Contact a service center..."

Googling had showed me that previously Atwood techs would tell the owner how to rule out the high-limit switch with a multimeter.

Guess those days are gone.
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Old 09-06-2017, 10:35 PM   #9
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Thanks for the suggestions. It was also happening, the next morning, when running the generator so I was thinking low voltage would not be an problem.

Wife also thinks the ducts might have been smushed a bit.

Anyway we have things to check!
Thank you all!
Smashed ductwork would be something to check if accessible , though it never would have worked properly with ductwork issues.

Your furnace runs on 12v whether you are plugged in, genny power, or boondocking. It can still be low voltage. It's easy to check the battery with a meter, or just run it down to the auto store for testing.
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Old 09-07-2017, 10:53 AM   #10
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Your furnace runs on 12v whether you are plugged in, genny power, or boondocking. It can still be low voltage. It's easy to check the battery with a meter, or just run it down to the auto store for testing.
Good to know - that could certainly be the issue.

I was checking the voltage, but using the Xantrex Inverter display. It was 12.3 which I thought would be enough. But it's worth double checking. Thank you!
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Old 09-08-2017, 01:56 PM   #11
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Good to know - that could certainly be the issue.

I was checking the voltage, but using the Xantrex Inverter display. It was 12.3 which I thought would be enough. But it's worth double checking. Thank you!
Yeah, don't go by that display. Disconnect house battery and check there with a meter. 12.3v at your battery would indicate its not charging to capacity any longer. Should show closer to 14v.
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