CLIFF918 Posted February 9, 2022 Share Posted February 9, 2022 Atwood furnace cycles 3 times then shuts off. Worked fine last time out. Needed to do some work inside today and this is what greeted me. Fan works and gas ignites 3 times and quits fan continues to run. Any Ideas? Link to comment Share on other sites More sharing options...
DavidL Posted February 9, 2022 Share Posted February 9, 2022 Not knowing the particular unit but it sounds like it is trying to light, a safety sensor is triggering, the system tries two more times and then goes to lock out. So, you will have to figure out what sensor is not happy and resolve that issue. Since it's a short cycle, sounds like some kind of flame sensor not seeing the furnace lighting. But that's just a guess. 1 Link to comment Share on other sites More sharing options...
Mark B Posted February 9, 2022 Share Posted February 9, 2022 Most likely the sail switch is bad. Common problem. The fan blows air against it allowing the furnace to continue to run. If the switch fails it shuts the furnace off. Not hard to fix. I suggest a YouTube search on your model. 1 Link to comment Share on other sites More sharing options...
CLIFF918 Posted February 9, 2022 Author Share Posted February 9, 2022 9 minutes ago, Mark B said: Most likely the sail switch is bad. Common problem. The fan blows air against it allowing the furnace to continue to run. If the switch fails it shuts the furnace off. Not hard to fix. I suggest a YouTube search on your model. Thanks, will try the switch Link to comment Share on other sites More sharing options...
Gary 05 AMB DST Posted February 9, 2022 Share Posted February 9, 2022 The switch isn't always defective. There could be some lint on the switch preventing it from opening. The switch is accessible from the outside. Gary 05 AMB DST 2 Link to comment Share on other sites More sharing options...
Rick A Posted February 9, 2022 Share Posted February 9, 2022 Another reason it might do this is if the gas/propane has run out. Link to comment Share on other sites More sharing options...
Solution CLIFF918 Posted February 9, 2022 Author Solution Share Posted February 9, 2022 10 minutes ago, Gary 05 AMB DST said: The switch isn't always defective. There could be some lint on the switch preventing it from opening. The switch is accessible from the outside. Gary 05 AMB DST Got it. Dirt on the switch was the cause. Thanks for the help. I was just over complicated it. 1 Link to comment Share on other sites More sharing options...
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