Trane Furnace Error Code 85: How to Fix It

Q: What causes Trane error code 85?

Error code 85 is caused by the low pressure switch opening, typically due to low refrigerant charge from a leak, blocked evaporator coil, dirty air filter, or faulty pressure switch.

Q: Can I run my Trane furnace with error code 85?

No, you should not operate the system with error code 85. This error indicates low refrigerant pressure which can damage the compressor and reduce system efficiency.

Q: How much does it cost to fix Trane error code 85?

Repair costs vary from $150-300 for filter replacement or cleaning to $500-1500 for refrigerant leak repair and recharge, depending on the underlying cause and local labor rates.

Q: How often should I change my air filter to prevent error code 85?

Change air filters every 1-3 months depending on usage, pets, and home conditions. A dirty filter restricts airflow and can contribute to pressure switch issues.

Q: Is error code 85 covered under Trane warranty?

Coverage depends on the specific issue and warranty terms. Refrigerant leaks may be covered under parts warranty, but installation or maintenance-related issues typically are not covered.

Abstract

Trane error code 85 indicates the low pressure switch has opened, typically caused by low refrigerant charge or a restriction in the evaporator coil. This is a serious issue that requires immediate attention to prevent compressor damage and restore proper heating and cooling operation.