Durham Region Air Conditioning Repair, Service and Installation
carrier air conditioner codes
IF YOUR SYSTEM ISN'T RUNNING
Check to make sure your control or thermostat is set in cooling mode. Make sure the temperature is set cooler than the current indoor temperature. If it isn't, your system won't know to provide cooling. Make sure your outdoor condensing unit is running. If it is not running, make sure the breakers in your home's breaker box or electrical panel are in the ON position. Check the main power switch for your outdoor unit, usually found within a few feet of the unit in a box mounted to the exterior of the house. Make sure it's in the ON position. Ensure that the blower motor in your furnace or fan coil is running. If the system is set for cooling, the blower motor should be running. If not, check to make sure your indoor unit switch is in the ON position.
Indoor Error Codes
CODE: E0.
RESULT: Indoor unit EEPROM parameter error.
RESULT: Indoor unit EEPROM parameter error.
CODE: E1.
RESULT: Indoor / outdoor units communication error.
RESULT: Indoor / outdoor units communication error.
CODE: E3.
RESULT: Indoor fan speed has been out of control.
RESULT: Indoor fan speed has been out of control.
CODE: E4.
RESULT: Indoor room temperature sensor T1 open circuit or shortcircuit.
RESULT: Indoor room temperature sensor T1 open circuit or shortcircuit.
CODE: E5.
RESULT: Evaporator coil temperature sensor T2 open circuit or short circuit.
RESULT: Evaporator coil temperature sensor T2 open circuit or short circuit.
CODE: EC.
RESULT: Refrigerant Leakage Detection.
RESULT: Refrigerant Leakage Detection.
CODE: F1.
RESULT: Outdoor ambient temperature sensor T4 open circuit or short circuit.
RESULT: Outdoor ambient temperature sensor T4 open circuit or short circuit.
CODE: F2.
RESULT: Condenser coil temperature sensor T3 open circuit or short circuit.
RESULT: Condenser coil temperature sensor T3 open circuit or short circuit.
CODE: F3.
RESULT: Compressor discharge temperature sensor T5 open circuit or short circuit.
RESULT: Compressor discharge temperature sensor T5 open circuit or short circuit.
CODE: F4.
RESULT: Outdoor unit EEPROM parameter error.
RESULT: Outdoor unit EEPROM parameter error.
CODE: F5.
RESULT: Outdoor fan speed has been out of control.
RESULT: Outdoor fan speed has been out of control.
CODE: P0.
RESULT: IPM malfunction or IGBT over-strong current protection.
RESULT: IPM malfunction or IGBT over-strong current protection.
CODE: P1.
RESULT: Over voltage or over low voltage protection.
RESULT: Over voltage or over low voltage protection.
CODE: P2.
RESULT: High temperature protection of compressor top diagnosis and solution.
RESULT: High temperature protection of compressor top diagnosis and solution.
CODE: P4.
RESULT: Inverter compressor drive error.
RESULT: Inverter compressor drive error.
CODE: P5.
RESULT: Mode conflict.
RESULT: Mode conflict.
CODE: P6.
RESULT: Compressor voltage protection.
RESULT: Compressor voltage protection.
Outdoor Error Codes
CODE: E0.
RESULT: Outdoor EEPROM malfunction.
RESULT: Outdoor EEPROM malfunction.
CODE: E2.
RESULT: Indoor/outdoor units communication error.
RESULT: Indoor/outdoor units communication error.
CODE: E3.
RESULT: Communication malfunction between IPM board and outdoor main board.
RESULT: Communication malfunction between IPM board and outdoor main board.
CODE: E4.
RESULT: Open or short circuit of outdoor unit temperature sensor.
RESULT: Open or short circuit of outdoor unit temperature sensor.
CODE: E5.
RESULT: Voltage protection.
RESULT: Voltage protection.
CODE: E8.
RESULT: Outdoor fan speed malfunction.
RESULT: Outdoor fan speed malfunction.
CODE: F1.
RESULT: No A Indoor unit coil outlet temperature sensor or connector of sensor is defective.
RESULT: No A Indoor unit coil outlet temperature sensor or connector of sensor is defective.
CODE: F2.
RESULT: No B Indoor unit coil outlet temperature sensor or connector of sensor is defective.
RESULT: No B Indoor unit coil outlet temperature sensor or connector of sensor is defective.
CODE: F3.
RESULT: No C Indoor unit coil outlet temperature sensor or connector of sensor is defective.
RESULT: No C Indoor unit coil outlet temperature sensor or connector of sensor is defective.
CODE: F4.
RESULT: No D Indoor unit coil outlet temperature sensor or connector of sensor is defective.
RESULT: No D Indoor unit coil outlet temperature sensor or connector of sensor is defective.
CODE: F5.
RESULT: No E Indoor unit coil outlet temperature sensor or connector of sensor is defective.
RESULT: No E Indoor unit coil outlet temperature sensor or connector of sensor is defective.
CODE: P1.
RESULT: High pressure protection.
RESULT: High pressure protection.
CODE: P2.
RESULT: Low pressure protection.
RESULT: Low pressure protection.
CODE: P3.
RESULT: Current protection of compressor.
RESULT: Current protection of compressor.
CODE: P4.
RESULT: Temperature protection of compressor.
RESULT: Temperature protection of compressor.
CODE: P5.
RESULT: High temperature protection of condenser.
RESULT: High temperature protection of condenser.
CODE: P6.
RESULT: IPM module protection.
RESULT: IPM module protection.
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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carrier air conditioner error codes
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
AC has no power
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - July 12, 2023
Moved into home 1 month ago. AC unit is 2020. The day before moved in. I had my buddy who owns AC company rip the whole thing out and clean it all. Cleaned the coils, did something with copper took him hours! He's a fucking legend Ac
Read MoreWhy is My AC Unit Acting Up?
- SUBMITTED BY:
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- - August 27, 2024
When your AC unit starts acting up, it can be due to several common issues: Dirty Air Filters: Clogged or dirty filters restrict airflow, making your AC work harder and less efficiently, leading to poor cooling and potential system damage.
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Read More5 Things You Should Know When Installing an Air Conditioner
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- - June 23, 2022
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