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Old 12-19-2014, 03:40 PM   #1
cbhughan
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Furnace Problem

Furnace will not ignite. Fan comes on when thermostat calls for heat but the furnace will not ignite within the one minute interval. The furnace is an Atwood Model 8535 IV DLCP in a 2014 Montana Big Sky 3725RL. I checked the furnace installation manual and there is an "Ignition Control Diagnostic Table". One lists codes for Standard Three Tries for Ignition Controls and one for 2 Stage 3 Controls For Ignition Controls. Not sure what that means but the red light on the mother board seems to be flashing with 3 second pause. Depending on which table is use it is either a limit switch/airflow issue or a low input voltage issue. Anybody have any suggestions?
 
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Old 12-19-2014, 03:58 PM   #2
Drifty1
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We do not have that new of unit but if I saw that fault and with the info provided I would double check the voltage at the battery. Low sail switch can be caused by low voltage...
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Old 12-19-2014, 04:13 PM   #3
cbhughan
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Thanks for the tip.
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Old 12-19-2014, 06:35 PM   #4
Rondo
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If the suggestion by Drifty1 does not work and since it is a new unit, within warranty time period, I would contact Keystone Customer Service and tell them of your problem. If you are not near your dealer that you purchased it from they may give you the name of one close to you to have it fixed.
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Old 12-19-2014, 11:59 PM   #5
JandC
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Mine has done the exact same thing off and on for almost a year. Generally I can do a master re-set and it will work for awhile and then it stops again.

As I have posted before, had mobile tech come out and he discovered igniter was not properly spaced. He corrected that and it worked for about 2 weeks and now it is doing the same thing. As a matter of fact it failed to ignite this morning and I had to do the re-set twice.

I will be having mine worked on at selling dealer on December 29th. If you get repaired prior to that please let me know what they had to do.
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Old 12-20-2014, 02:14 AM   #6
Ozz
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You can have a bad sail switch, or a marginal working one, with the circuit board, that is the wild card, sometimes they get wet.. or high moisture; no direct contact with water, and they will give confusing and conflicting symptoms. Sometimes, a good blast of compressed air into the burner tubes will clear them of some kind; different kinds, of obstructions causing the sail switch to not prove. Give the compressed air a try.
But pay attention to the diagnostic codes, they are helpful

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Old 12-20-2014, 03:03 AM   #7
Irlpguy
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If you are boondocking or not hooked to shore power then I would bet on the voltage, that has happened more times than I care to count with my daughters furnace in her horse trailer. As mentioned the sail switch can fail or be marginal, also as mentioned improper adjustment of the igniter point spacing. The other possibility not so far mentioned is the flame sensor, if that does not see a flame in a certain period of time it will close the gas valve.

Usually the diagnostic blinking of the LED will indicate the fault. Good luck with a solution.


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Old 12-24-2014, 01:05 PM   #8
jlb27537
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Been there, done that last winter...........

You do not mention you checked LP pressure AT the FURNACE. It MUST/SHOULD be 11.0wc. I had to turn my LP regulator adjusting screw all the way in and only got to 10.5wc at the furnace.

Next check the igniter air gap. Using a 1/8" drill bit it MUST be no wider than 1/8"

Next voltage, it will work if you have 10.5vdc but a higher voltage gives a better spark.

The code of a sail switch, look for mud daubers blocking the movement. A sail switch is either on or off code.

Also, If you are in a southern location, a lot of mobile RV Techs can handle Warranty issues. This is a Atwood issue, NOT a Keystone issue.

I had a Mobile RV Service tech to the rig 5 times last winter before we got it working. We fixed it in steps. I got a good handle on the furnace. (Field Training)

Jim

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Old 12-24-2014, 01:57 PM   #9
Happycamperscolorado
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had a SOB a couple of years ago and mine did the same thing. issue was wife leaned a outdoor chair against the heater unit outside and blocked the air coming in. moved the chair and it lite right away.
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Old 09-26-2015, 03:47 AM   #10
biznsa
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JandC, did you have your heater repaired? If so, what was the problem? I'm having the same experience on mine. Light on control board gives 3 flashes, then 3 second delay and 3 more flashes. Manual says I have an Ignotion Control Module problem.
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Old 09-26-2015, 03:48 AM   #11
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JandC, did you have your heater repaired? If so, what was the problem? I'm having the same experience on mine. Light on control board gives 3 flashes, then 3 second delay and 3 more flashes. Manual says I have an Ignotion Control Module problem.
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Old 09-26-2015, 05:36 AM   #12
cbhughan
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Quote:
quote:Originally posted by biznsa

JandC, did you have your heater repaired? If so, what was the problem? I'm having the same experience on mine. Light on control board gives 3 flashes, then 3 second delay and 3 more flashes. Manual says I have an Ignotion Control Module problem.
Yes I had it repaired under warranty at Lazy Days in Tucson Arizona on 12/23/2014. They replaced something called a Sail Switch. If I am reading the invoice correctly the part number is 8535IV. Good luck.
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Old 09-26-2015, 05:39 AM   #13
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I had the problem fixed under warranty at Lazy Days RV Center in Tucson Az on 12/23/2014. They replace something called a Sail Switch. If I am reading the repair invoice correctly the part number was 8535IV
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Old 09-26-2015, 06:11 AM   #14
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Quote:
quote:Originally posted by biznsa

JandC, did you have your heater repaired? If so, what was the problem? I'm having the same experience on mine. Light on control board gives 3 flashes, then 3 second delay and 3 more flashes. Manual says I have an Ignotion Control Module problem.
I'm not sure who you were asking about having their furnace fixed. If you were asking JandC, then the answer is "no". Lazy Days (Tampa) of course couldn't figure it out in the 2 minutes they devoted to it. We are waiting this fall until we need it and then we will have the mobile tech back out.
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Old 09-26-2015, 06:41 AM   #15
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All of the codes, except ckt board fail, have a three second pause. If you are getting three flashes with pause...then it is ignition lockout caused by electronics not seeing enough gas flow...not getting ignition for whatever reason. If you wait awhile, then watch the code led while someone else turns on the furnace...do you see another code flashed prior to a three flash, ie, one flash three sec pause for limit or sail or airflow issue...or two flash for flame issue? John
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Old 09-27-2015, 01:48 AM   #16
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Quote:
quote:Originally posted by jcurtis934

All of the codes, except ckt board fail, have a three second pause. If you are getting three flashes with pause...then it is ignition lockout caused by electronics not seeing enough gas flow...not getting ignition for whatever reason. If you wait awhile, then watch the code led while someone else turns on the furnace...do you see another code flashed prior to a three flash, ie, one flash three sec pause for limit or sail or airflow issue...or two flash for flame issue? John
Three flashes, nothing else. Replaced Ignition Contro Module (sometimes referred to a motherboard.). No more problems.
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