York Error Code R3: Pressure Switch Stuck Open
Warning: 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.
How to Reset York Code R3
- Turn off the furnace power switch, usually located on or near the unit.
- Turn off the circuit breaker for the furnace. Wait 30 seconds.
- Restore power at the breaker and flip the furnace switch back on.
- Set the thermostat to call for heat. If the error code returns after 2-3 ignition attempts, the fault requires repair.
What does 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.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Pressure Switch | 024-36370-000 | — |
| Inducer Motor | S1-02435933000 | — |
| Pressure Switch Tubing | — | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| R1 | Flame Without Call | Critical |
| R2 | Pressure Switch Stuck Closed | Warning |
| R4 | High Limit Switch Open | Warning |
| R5 | Rollout Switch Open | Critical |
| R6 | Gas Valve Failure | Critical |
| R7 | Ignition Lockout | Critical |
| R9 | Reversed Polarity | Critical |
| A4 | Improper Thermostat Wiring | Warning |
| AF | Low Flame Current | Critical |