R3 🟡 Repair Required
York Error Code R3: Pressure Switch Stuck Open
⚠️ Your York furnace has detected a problem with its pressure switch, which could cause it to shut down. This prevents the furnace from running and providing heat.
How to Fix York Code R3
- Step 1: Check the furnace vent outside your home for any visible obstructions like snow, ice, or leaves. Safely clear any blockages you can reach.
- Step 2: Ensure that all return air vents are unblocked and clean. A lack of airflow can cause the furnace to overheat and shut down.
- Step 3: If the error persists after checking the vents, contact a qualified HVAC technician to diagnose and repair the furnace.
What Does York Error Code R3 Mean?
The R3 error code on your York furnace indicates that the pressure switch is stuck in the open position. This switch is a safety device that verifies the furnace's exhaust fan (inducer motor) is working correctly before allowing the burners to ignite. When the inducer motor starts, it creates a slight vacuum that closes the pressure switch, signaling to the control board that it's safe to start the ignition sequence. If the switch remains open, the furnace control board will prevent ignition and display the R3 error. This is a safety feature to prevent the furnace from operating improperly, which could lead to a dangerous buildup of exhaust gases inside your home.
Common Causes of York Code R3
- Blocked vent pipe: Obstructions like snow, ice, leaves, or debris can prevent the inducer motor from creating enough vacuum to close the pressure switch.
- Failed inducer motor: A weak or failing inducer motor may not generate sufficient vacuum to activate the pressure switch.
- Faulty pressure switch: The pressure switch itself may be defective and not closing even when the correct vacuum is present.
- Blocked or kinked pressure switch tubing: The small tube connecting the inducer motor to the pressure switch can become blocked or kinked, preventing the vacuum from reaching the switch.
- Condensate blockage: Excessive condensate buildup in the furnace can block the vent or pressure switch tubing.
Applicable York Models
Need a Pro to Fix York Code R3?
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Find a Licensed Tech Near You →Replacement Parts for York HVAC System Code R3
Pressure Switch OEM: 024-36370-000
Inducer Motor OEM: S1-02435933000
Pressure Switch Tubing