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Atwood 8535-IV DCLP Furnace Greg Kompelien 3-28-14  
On Atwood 8535-IV DCLP Furnace I am having problems with the burner only firing up for approximately 5 seconds and then shuts down. The blower continues to run and then about 1 minute later the burner will cycle on again for another 5 seconds. This will keep repeating itself until the furnace is shut down. If it is turned back on it will do the same thing, over and over again. The circuit board has been tested at an RV repair shop and all of the electrical connections have been cleaned of any oxidation. And the sail switch and limit switches seem to be working fine and check out with an ohm meter. What can be causing this?
Re: Atwood 8535-IV DCLP Furnace Keith 3-28-14  
Hi Greg, this is right out of the troubleshooting guide from Atwood:

LIMITING = BURNER CYCLING ON AND OFF - BLOWER RUNS CONSTANTLY WITH THERMOSTAT ON
Restricted or insufficient discharge ducting a. Ducting must meet furnace’s minimum requirements.*
b. No excess ducting or unnecessary bends.*
c. All closeable registers must be fully open and unrestricted.*

Furnace over fired - Set gas pressure to a minimum of 11˝ W.C. with all appliances running. Replace regulator, if not obtainable. Also, check main
burner orifice, it must comply with furnace’s specifications.*
Restricted return air supply - Make sure return air meets furnace minimum requirements.*

Defective limit switch - Replace limit switch.

A tech with a manometer or low pressure air dial gauge will have to do the LP pressure check. Good luck
Re: Atwood 8535-IV DCLP Furnace BUBBA THE BUS TECH 3-28-14  
5 seconds sounds to me to be a miss aligned ignitor gap or less likely considering age/model a burnt-out burner.

If the gap is incorrect the dang thing will light go out relight go out etc.

Bad burner same symptom
Re: Atwood 8535-IV DCLP Furnace Fernando 12-11-15  
Hello, my Atwood 8535-IV furnace will not lite...The blower turns on and it does not lite?
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