York Furnace Model P2UHD20N08001A
When the gas furnace was first powered on this winter it did work for a week or so. Then it stopped
... I replaced filter.
The furnace would then power on, good gas cones visible, then shut off after a few minutes
I checked the error codes and 4 flashes said limit switch open.
... I replaced the limit switch with matching size and specs of 175F/145F (OEM Part #S1-2702-316P/A)
The furnace stayed on for about 15 hours with the new limit switch then shut off again.
... I checked the three rollout switches. All had continuity.
... I checked the furnace overflow pipe and the vent. No blockage in either.
... I removed the flame sensor and cleaned it. Reinstalled same flame sensor.
This time the furnace stayed on for about 30 hours before shutting off.
Left it off overnight. Turned back on this morning. Running a few hours so far but all signs point to it shutting off again.
Any input would be greatly appreciated. Thank you.
When the gas furnace was first powered on this winter it did work for a week or so. Then it stopped
... I replaced filter.
The furnace would then power on, good gas cones visible, then shut off after a few minutes
I checked the error codes and 4 flashes said limit switch open.
... I replaced the limit switch with matching size and specs of 175F/145F (OEM Part #S1-2702-316P/A)
The furnace stayed on for about 15 hours with the new limit switch then shut off again.
... I checked the three rollout switches. All had continuity.
... I checked the furnace overflow pipe and the vent. No blockage in either.
... I removed the flame sensor and cleaned it. Reinstalled same flame sensor.
This time the furnace stayed on for about 30 hours before shutting off.
Left it off overnight. Turned back on this morning. Running a few hours so far but all signs point to it shutting off again.
Any input would be greatly appreciated. Thank you.
source https://hvac-talk.com/vbb/threads/2244281-Gas-furnace-shuts-off-after-one-day?goto=newpost
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