Carrier Error Code 31: High Stage Pressure Fault
How to Fix Carrier Code 31
- Step 1: Turn off the HVAC system at the thermostat.
- Step 2: Inspect the outdoor unit for any obvious obstructions, such as leaves, debris, or snow, blocking airflow to the condenser coil. Clear away any obstructions.
- Step 3: Wait 30 minutes, then turn the system back on at the thermostat. If the error code reappears, contact a qualified HVAC technician for further diagnosis and repair.
What Does Carrier Error Code 31 Mean?
The Carrier error code 31, or a blinking LED pattern indicating code 31, signals that the system's high-pressure switch has tripped during high-stage operation. This switch is a safety device designed to shut down the compressor when the refrigerant pressure gets too high, preventing damage to the compressor and other components. The high-stage refers to when the unit is operating at its maximum cooling or heating capacity. This error usually means there's a restriction in the refrigerant flow, a problem with the compressor, or an issue with the outdoor fan motor. It's important to address this issue promptly to prevent further damage to your HVAC system. Because this code indicates a locked-out system, you will likely need a professional to diagnose and fix the root cause.
Common Causes of Carrier Code 31
- Dirty outdoor condenser coil restricting airflow.
- Faulty high-pressure switch.
- Refrigerant overcharge.
- Failed or failing outdoor fan motor.
- Restriction in the refrigerant lines (kinked or blocked).
Applicable Carrier Models
Need a Pro to Fix Carrier Code 31?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →