Trane furnace runs for hours or days then stops.

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Old 11-11-19, 12:57 PM
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Trane furnace runs for hours or days then stops.

I have a Trane xv80 furnace. It will run for anywhere from 12 hours to 3 days without fault, then stop with the induction fan running constant. It is giving me a pressure switch code. A friend that works in HVAC said the switch going is a common problem. I replaced it last Tuesday, it ten great until Friday afternoon. Then stopped again. I have checked for blockage in the line, the filter is clean, as stated earlier the fan runs just fine. If I flip off the power supply for a few seconds, it will restart and run again. Iím terrified of heights, and our roof has a steep pitch, so I have not gone up to check the vent. Is there anything else I may be missing beside checking the vent?
 
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Old 11-11-19, 04:20 PM
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Welcome to the forums.

Pressure switches rarely go bad. Your problem may be as simple as a little clog. Take the hose off the draft inducer. Get a small drill bit, broom bristle or straight pin and clean out the micro hole in the hose connection. The hole is at the bottom of the fitting. Your cleaning device needs to go in at least an inch.

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Old 11-11-19, 07:19 PM
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thank you for your response. I checked for blockage there this morning, and just checked with something longer, it doesnít look or feel like there is anything blocking the inlet.
 
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Old 11-12-19, 02:12 PM
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needs to be checked with a manometer.

could be a failing inducer, bad heat exchanger, blockage right at the exhaust outlet. odd that it's intermittent.
 
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Old 11-12-19, 02:26 PM
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Thatís what is so bizarre, itís unpredictable when it will fail or not.
 
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Old 11-12-19, 04:35 PM
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Thatís what is so bizarre, itís unpredictable when it will fail or not.
 
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Old 11-18-19, 10:50 AM
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Update

Okay, the temperature hasnít dipped below freezing since I posted this, and the heater has had no issues. That leads me to believe that something is icing up, and creating the blockage? Would that make any sense? If so, any ideas on what I need to check?
 
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