Carrier Heat Pump Error Code 73: How to Fix It

Q: What causes Carrier heat pump error code 73?

Error code 73 is caused by internal protection systems detecting unsafe conditions like high refrigerant pressure, low refrigerant levels, electrical faults, or compressor overheating. The system locks out to prevent expensive damage.

Q: Can I reset Carrier error code 73 myself?

You can try resetting by turning off power for 5 minutes and restarting, but if the underlying problem isn't fixed, the error will return. Simple resets work for temporary glitches but not mechanical failures.

Q: How much does it cost to fix error code 73 on a Carrier heat pump?

Repair costs vary widely depending on the cause. Simple fixes like replacing a contactor cost $150-300, while major repairs like compressor replacement can cost $1500-3000. Diagnostic fees typically range from $100-200.

Q: Is error code 73 dangerous for my Carrier heat pump?

The error itself protects your system from dangerous conditions. However, continuing to operate with repeated lockouts can cause permanent damage to the compressor, which is the most expensive component to replace.

Q: How long does Carrier heat pump error code 73 lockout last?

The lockout remains active until the system is manually reset and the underlying problem is resolved. Some lockouts have time delays of 5-15 minutes before allowing restart attempts, while others require complete power cycling.

Abstract

Carrier heat pump error code 73 indicates the outdoor unit has been locked out due to internal protection systems activating. This critical error typically occurs when sensors detect unsafe operating conditions like high pressure, low refrigerant, or electrical faults that could damage the compressor.