Carrier Heat Pump Error Code 55: How to Fix It

Q: What causes Carrier error code 55 polarity reversal?

Error code 55 is typically caused during initial installation when the electrician incorrectly connects the L1 and L2 power wires backwards, or after electrical work where wires were reconnected incorrectly. It can also occur if there was a power surge that affected the electrical connections.

Q: Can I run my Carrier heat pump with error code 55?

No, you should never attempt to run your heat pump with error code 55. Reversed polarity can cause serious damage to the compressor, control boards, and other electrical components. Turn off the system immediately and correct the wiring issue.

Q: Will error code 55 clear itself on a Carrier heat pump?

No, error code 55 will not clear itself because it's detecting an actual wiring problem. The L1 and L2 wires must be physically swapped to correct the polarity issue before the error will clear.

Q: How do I know if L1 and L2 wires are swapped correctly?

After swapping the L1 and L2 wires, turn the system back on. If the error code 55 clears and the heat pump operates normally, the polarity is now correct. If the error persists, there may be another wiring issue that requires professional diagnosis.

Q: Is Carrier error code 55 covered under warranty?

Wiring issues like reversed polarity are typically not covered under manufacturer warranty since they're considered installation errors rather than equipment defects. However, if discovered during initial startup by the installing contractor, they should correct it at no charge.

Abstract

Carrier heat pump error code 55 indicates that the line voltage polarity is reversed, meaning the L1 and L2 wires are connected backwards. This is a critical electrical issue that prevents your heat pump from operating properly and must be corrected immediately to avoid damage to the system.