Amana Error Code 3R: Pressure Switch Open
Warning: Your Amana furnace has detected a problem with its pressure switch, which means it's likely shut down for safety and won't produce heat until it's fixed.
How to Fix Amana Code 3R
- Step 1: Check the furnace vent pipes (usually PVC) outside your home. Make sure they aren't blocked by snow, ice, leaves, or debris.
- Step 2: Ensure all registers and vents in your home are open and unobstructed. This helps maintain proper airflow throughout the system.
- Step 3: If the problem persists after checking the vents, it's best to call a qualified HVAC technician to diagnose and repair the issue.
How to Reset Amana Code 3R
- 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 3R mean?
The '3R' error code on your Amana furnace indicates that the pressure switch opened unexpectedly during operation. This switch is a critical safety component that verifies the furnace's exhaust fan (inducer motor) is working correctly and venting combustion gases safely outside your home. When the furnace starts, the inducer motor creates a slight vacuum. The pressure switch senses this vacuum and closes, telling the furnace's control board it's safe to ignite the gas. If the switch opens unexpectedly during a heating cycle, the control board shuts down the furnace to prevent potential hazards like carbon monoxide buildup.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Pressure Switch | — | — |
| Inducer Motor | — | — |
| Pressure Switch Tubing | — | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| 1R | Flame Without Call | Critical |
| 2R | Pressure Switch Stuck Closed | Warning |
| 4R | High Limit / Rollout | Critical |
| 5R | Ignition Lockout | Critical |
| 6R | Gas Valve Relay Fault | Critical |
| 7R | Low Flame Signal | Critical |
| 8R | Reversed Polarity | Critical |
| 9R | Blower Motor Fault | Warning |
| 10R | Communication Error | Warning |