Atwood 8535-IV Series Furnace
Can someone help me understand why my 2005 Atwood 8535-IV Series furnace now dies out with an “Ignition Lockout Fault” (3 blinks on the circuit board)? I have replaced the thermostat, the circuit board and the L-190 temperature limiting switch. All to no avail.
The furnace seems to work OK as long as it is able to heat the RV to the desired temperature within a certain time period, such as 14 minutes. Beyond that period, the furnace shuts down. If I give it 5 or 10 minutes, I can get the furnace to come back on by either (1) turning off the thermostat switch and then on or (2) by backing off the thermostat temperature lever and then bringing it back up to the desired RV temperature . The furnace would then work fine for a time, say, 14 minutes.
Using a small electric heater to supplement the furnace, we were able to go through the March and April nights in lower New Mexico without a shut down. But this does not work in the months of January and February or when we are traveling south from Maine without the benefit of shore power.
I can’t be the only person who has experienced this problem with an Atwood furnace among the vast RV community. Before I take my RV into a RV service shop (at $100 per hour) that “will look at it”, I would like to know what the problem is and where next to look for a solution. I would rather not have to spend a couple hundred dollars only to be told that the entire furnace has to be replaced!
Any suggestions would be appreciated.
The furnace seems to work OK as long as it is able to heat the RV to the desired temperature within a certain time period, such as 14 minutes. Beyond that period, the furnace shuts down. If I give it 5 or 10 minutes, I can get the furnace to come back on by either (1) turning off the thermostat switch and then on or (2) by backing off the thermostat temperature lever and then bringing it back up to the desired RV temperature . The furnace would then work fine for a time, say, 14 minutes.
Using a small electric heater to supplement the furnace, we were able to go through the March and April nights in lower New Mexico without a shut down. But this does not work in the months of January and February or when we are traveling south from Maine without the benefit of shore power.
I can’t be the only person who has experienced this problem with an Atwood furnace among the vast RV community. Before I take my RV into a RV service shop (at $100 per hour) that “will look at it”, I would like to know what the problem is and where next to look for a solution. I would rather not have to spend a couple hundred dollars only to be told that the entire furnace has to be replaced!
Any suggestions would be appreciated.
