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Old 04-01-2019, 11:38 AM   #1
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Atwood furnace

Has anyone had issues with there furnace? I have a 2018 Crusader 340RST. And my furnace went out. It starts up fan blows for 30sec never tries to light the goes off. Any ideas? Thx.
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Old 04-01-2019, 11:44 AM   #2
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Has it worked previously?
Did you recently run out of propane or possibly this is the first fire-up of the season?

Do you hear clicking/sparking during the 30 seconds of runtime?
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Old 04-01-2019, 12:14 PM   #3
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Yes it worked all winter. No have not run out of propane. No clicking to try to light during 30 sec run time.
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Old 04-01-2019, 12:16 PM   #4
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When we have run out and have to switch tanks the furnace clicks a bunch trying to relight. It has happened over the winter
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Old 04-01-2019, 12:26 PM   #5
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could be a couple things . but i'll bet the board has gone . since you run pout of propane a time are two the the furnace kept trying to light during those times you burnt up the spark coil on the board . just my opinion on the issues with out being able to check other components
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Old 04-01-2019, 12:37 PM   #6
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My guess would be the board is not seeing the sensor that tells if the blower is running. If it doesn't see the blower, it will not activate the gas valve or the spark igniter. The sensor is refereed to as a Sail Switch. Residential furnaces have the same technology on them. So either board or sensor could be bad.
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Old 04-01-2019, 12:56 PM   #7
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My heater was doing that, soon after I bought the RV. The dealer had to replace the board. It has worked fine since then. That board controls everything. From what I was told by the dealer (when they fixed it), the majority of the issues with that brand is the control board.

If it is still under warranty, I'd have someone look at it for you and they can then fix it.
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Old 04-01-2019, 01:04 PM   #8
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Originally Posted by TheWolfPaq82 View Post
My guess would be the board is not seeing the sensor that tells if the blower is running. If it doesn't see the blower, it will not activate the gas valve or the spark igniter. The sensor is refereed to as a Sail Switch. Residential furnaces have the same technology on them. So either board or sensor could be bad.
The sail switch is a switch not a sensor . it makes contact and closes a circuit then the ignition process starts . most residential furnaces now days have pressure switches
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Old 04-01-2019, 01:28 PM   #9
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10-4 bad board. Ya I talked to place I bought trailer they went thru a trouble shooting and tried a factory reset I work temp. Came on for two times heat needed now nothing. Even after reset again. I bet bad board.
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Old 04-11-2019, 07:31 AM   #10
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If it's still under warranty, let them replace the board but when it goes out again and it's not under warranty, and it probably will, replace it with a dinosaur electronics brand. Way more reliable than factory board.
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Old 04-11-2019, 07:48 AM   #11
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I had the same problem with a previous camper furnace. I was told about replacing the control board also. I was told that the replacement boards from "dinosaur electronics" were the best. I went online and ordered one and it came in very quickly. It was easy to replace and also has a light on it to tell if it is getting power.
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Old 04-11-2019, 09:33 AM   #12
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To assist those who have Atwood 79, 85 and 89 series furnaces, the Furnace Service Manual has been uploaded the to the Library section of FRF. It may need to be approved by FRF, so until then I will attach it here.
Attached Files
File Type: pdf hflamefurn04.pdf (1.51 MB, 10 views)
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Old 04-11-2019, 09:41 AM   #13
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The sail switch is a switch not a sensor . it makes contact and closes a circuit then the ignition process starts . most residential furnaces now days have pressure switches
Same as a RV furnace...if the switch is bad, it tells the board to not open gas valve.
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Old 04-11-2019, 10:15 AM   #14
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It has been my experience reading about problems with the furnace lighting, about half the time, the battery is weak!
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Old 04-11-2019, 03:20 PM   #15
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Check time delay first, then sail switch.
Google below for a nice furnace write up

Gary Brink rvforum.net. Furnace troublshooting, worked for me
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Old 04-14-2019, 07:52 AM   #16
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Symptom of no igniter sparking is the key. First check is the sail switch. Second check is the igniter. If all else fails it's probably the board.
X2 on the Dinosaur boards.
If it were sparking I would suspect the flame sensor, but you're saying no spark. Be sure if you take it apart you clean the flame sensor.
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Old 04-14-2019, 08:02 AM   #17
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Same as a RV furnace...if the switch is bad, it tells the board to not open gas valve.
NO has nothing to do with gas valve really . when the circuit is complete through the sail switch and high limits after a call for heat the board tells the igniter to spark then gas on then flame sense and away you go .
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Old 06-16-2019, 02:15 PM   #18
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I had the same problem after driving through a rainstorm. Before exploring deeper, sail switches, mother board, etc. I disconnected and reconnected all of the connections I could easily access on the furnace. That fixed the problem, when it happens again Iíll include a little WD40.
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