Carrier Heat Pump Error Code 31: How to Fix It

Q: What causes Carrier error code 31?

Error code 31 is caused by the high pressure switch opening due to excessive refrigerant pressure. This typically happens when the outdoor coil is dirty, blocked, or when there's insufficient airflow through the system.

Q: Can I run my Carrier heat pump with error code 31?

No, you should not run the heat pump with error code 31. The high pressure switch is a safety feature that prevents damage to the compressor. Continuing to run the system could cause expensive damage.

Q: How often should I clean my Carrier heat pump outdoor coil?

Clean the outdoor coil at least twice per year - once before cooling season and once before heating season. In dusty or high-pollen areas, you may need to clean it more frequently.

Q: Will a dirty air filter cause error code 31?

Yes, a severely dirty or clogged air filter can restrict airflow enough to cause high pressure and trigger error code 31. Always check and replace the air filter as part of troubleshooting.

Q: How do I reset my Carrier heat pump after fixing error code 31?

Turn off power to the unit for 30 minutes, then restore power. Some models have a reset button on the outdoor unit. If the underlying issue is fixed, the error should clear automatically.

Abstract

Carrier heat pump error code 31 indicates the high pressure switch has opened due to excessive refrigerant pressure. This typically happens when the outdoor coil is dirty or blocked, or when there's insufficient airflow through the system.