Hi there, my Trane XV80 furnace stopped working intermittently with the error code indicating error with the pressure switch. Each time I had to reset it by power cycling the furnace. I checked the pressure switch is fine by ohming it out. This switch is normally open, and it closes when there is enough suction on the tube. The inducer motor seems to work fine too. I monitor the voltage across the wires to the pressure switch. When there is a call for heat, the voltage goes to 24V AC. The inducer motor runs and the voltage drops to 0V, and then the furnace fires up as expected.
Fyi- When the furnace stalls with the pressure switch error code, the voltage on the wires to the pressure switch is 0V.
Strangely my furnace is able to run fine for the past few days with the wires to the pressure switch completely unplugged!
I first turned off the power to the furnace. Then unplug the two wires to the pressure switch. Turn the power to furnace back on. Then raise the thermostat to call for heat. And the furnace fires normally. I can then cycle the furnace normally by raising and lowering the thermostat. And the wires to pressure switch were unplugged the whole time! Is there something wrong with my circuit board??
Fyi- When the furnace stalls with the pressure switch error code, the voltage on the wires to the pressure switch is 0V.
Strangely my furnace is able to run fine for the past few days with the wires to the pressure switch completely unplugged!
I first turned off the power to the furnace. Then unplug the two wires to the pressure switch. Turn the power to furnace back on. Then raise the thermostat to call for heat. And the furnace fires normally. I can then cycle the furnace normally by raising and lowering the thermostat. And the wires to pressure switch were unplugged the whole time! Is there something wrong with my circuit board??
source https://hvac-talk.com/vbb/showthread.php?2223898-Pressure-Switch-Error-Code&goto=newpost
No comments:
Post a Comment