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Jayco furnace doesn't stay lit


Wilieco

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Hi

I was hoping for some help troubleshooting my furnace. It is an Atwood Mobile model 8531-IV-DCLP in a 2004 Jayco Greyhawk. The furnace spins the fan as normal and then lights as it should. It burns for about 10 seconds and goes out. It relights and burns for another 10 seconds and goes out and then relights a 3rd time burns for 10 seconds or so and then goes out and shuts off and locks out. If I reset the furnace (turn heat off at thermostat and back on) it will repeat this process all over again. Usually on the 3rd time it will fire and burn normally. Sometimes it take 4 or 5 times of resetting it. Sometimes it will just light normal. When I first got the RV it did this and I ran around trying to get advice and it just started working and it worked for 4 trips with no issues. Then while parked at home went out to do some cleaning and went to light the furnace it did it again. I find it odd that it has only did it at home. Since it lights I would assume that the fan, sail switch, and ignitor are all good. I can hear it burn and also went outside and can fell the heat from the exhaust. Seems that furnace is not sensing that it is lit and shuts off. I can't seem to find anything that tells me how the furnace knows if it is lit. Thanks in advance for any help

Walt

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Before you start throwing parts at it, try pulling off the ignitor wire on the circuit board and reconnecting it a few times to clean up the contacts. The flames sense circuitry works at the millivolt level, and it takes very little corrosion to interfere with it. Since the ignitor is apparently igniting the gas properly, it's likely ok. The ignitor is not usually prone to being intermittent. The circuit board can be intermittent though.

Dutch
2001 GBM Landau 34' Class A
F-53 Chassis, Triton V10, TST TPMS
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/brake system

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