Durham Region Air Conditioning Repair, Service and Installation
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 16, 2022
Very pleased with the installation of our new furnace and A/C unit. From quotation stage to the completion of the job Twintech was very professional.
Thank you for a job well done.
Aug 15, 2022
My old water heater quit on me. I called TwinTech. In less than 4 days, I had my new water heater installed and the old one taken away. The whole process was quick, easy, pleasant, and well done. This is the third time I've dealt with TwinTech and I've been satisfied each time.
Aug 14, 2022
I had them replace my furnace last year. When it came time for the air conditioner this year, I did not hesitate to call Twintech again. I will also have them perform regular maintenance on them.
Aug 13, 2022
We required a new HVAC replacement after running the old
system for 18 years.
Dave understood our requirements and gave us a quote that
covered all the necessary items.
Installation was fast and very tidy. Everything works as
it should. Our thanks to Greg, Mitch and others for their
excellent work. Recommend this family owned business to
anyone else, considering HVAC or other work.
Aug 12, 2022
I needed a new furnace and A/C to replace my 21 yr. old units, and went to the internet to view potential companies in May, I received 3 quotes,
and chose Twintech based on their salesman Dave who was very detailed and covered off everything on what Twintech was all about,
an extremely dedicated company with so many years of experience, and after reading the on line reviews I was sold on Twintech, who did not disappoint as the installation team were top notch with Greg leading,
I would highly recommend this company without any doubts, in my books they are first class all the way. Our new Amana furnace and A/C are working perfectly !
Aug 11, 2022
Flawless transaction. They did exactly what they promised, showed-up on time, cleaned-up, and were highly professional. Highly recommended.
Aug 10, 2022
Salesperson and 2 man installation team were all professional and
knew their stuff. All three were friendly and helpful, answering all
my questions. The quality of their work demonstrated their experience
and expertise in their field.
Aug 9, 2022
A dear late cousin of mine recommended this company and I have been happy with the service.
Aug 8, 2022
We are very pleased with the work done by Twintech. They were very professional from start to finish. Dave came to our home and gave us a very competitive quote for new high efficiency furnace and air conditioner. The installers were very courteous and professional. We would highly recommend them.
Aug 7, 2022
Great experience getting an old furnace replaced.
Sales Guy (Dave) was great - honest, responsive, and friendly.
The work itself was done quickly and we are very happy with the outcome, thank you! We recommend TwinTech!
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!
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