Carrier / Comfort 22
Carrier PC02 error code
PC02 means the compressor top or inverter module temperature protection has operated. The unit is protecting expensive outdoor electronics and the compressor.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
PC02 means the compressor top or inverter module temperature protection has operated. The unit is protecting expensive outdoor electronics and the compressor.
Urgency
advisory
Try only the safe reset/check in the owner's manual. If the code returns, stop using the system until it is diagnosed.
Likely causes
- Carrier Table 4 identifies PC02 as compressor top or IPM temperature protection.
- Carrier troubleshooting lists dirty heat exchangers, blocked airflow, refrigerant amount, compressor, and voltage conditions as possible performance causes.
Homeowner fix
Turn the system off. Clean the indoor filter and make sure indoor and outdoor air paths are not blocked. Power reset once if safe; if PC02 returns, call for service.
When to call a pro
Call a licensed HVAC technician if PC02 returns after the airflow checks and one reset. Tell them Carrier identifies PC02 as compressor top/IPM temperature protection.
This code points to refrigerant or sealed-system, compressor, and electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
This is normally a repair diagnosis, not an automatic replacement signal. If a technician confirms a major board, compressor, fan-motor, or sealed-system repair on older out-of-warranty equipment, compare the quote with replacement.
See Carrier mini-splitsYour Carrier model
Comfort 22 model pages in the Carrier catalog help compare this repair path with current replacement options.
- Carrier Comfort 22 9,000 BTU R-454B 115V (45MHHAQ09XC1 / 37MHRAQ09AA1)
Comfort 22
- Carrier Comfort 22 9,000 BTU R-454B 208/230V (45MHHAQ09XC3 / 37MHRAQ09AA3)
Comfort 22
- Carrier Comfort 22 12,000 BTU R-454B 115V (45MHHAQ12XC1 / 37MHRAQ12AA1)
Comfort 22
- Carrier Comfort 22 12,000 BTU R-454B 208/230V (45MHHAQ12XC3 / 37MHRAQ12AA3)
Comfort 22
For your technician
Technician note: verify outdoor/indoor airflow, coil condition, fan operation, refrigerant charge/flow, compressor temperature, IPM cooling, and supply voltage. Page context: Carrier maps this display to the Comfort 22 line; source: Carrier 45MHHAQ High Wall Heat Pump Owner's Manual, Table 4 Error Codes; display convention: match the letter P, letter C, and two marker exactly before comparing neighboring codes.
Which systems show it
Comfort 22
Related troubleshooting
Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.
Related codes
Source
- Document
- Carrier 45MHHAQ High Wall Heat Pump Owner's Manual, Table 4 Error Codes