Durham Region Air Conditioning Repair, Service and Installation
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CODE: O P.
RESULT: Normal operation.
RESULT: Normal operation.
CODE: E 0.
RESULT: Lockout due to excessive retries.
RESULT: Lockout due to excessive retries.
CODE: E 1.
RESULT: Low-stage pressure switch stuck closed at start of heating cycle.
RESULT: Low-stage pressure switch stuck closed at start of heating cycle.
CODE: E 2.
RESULT: Low-stage pressure switch stuck open.
RESULT: Low-stage pressure switch stuck open.
CODE: E 3.
RESULT: Open high-limit switch.
RESULT: Open high-limit switch.
CODE: E 4.
RESULT: Flame detected when no flame should be present.
RESULT: Flame detected when no flame should be present.
CODE: E 5.
RESULT: Open fuse.
RESULT: Open fuse.
CODE: E 6.
RESULT: Low flame signal.
RESULT: Low flame signal.
CODE: E 7.
RESULT: Igniter fault or improper grounding.
RESULT: Igniter fault or improper grounding.
CODE: E 8.
RESULT: High-stage pressure switch stuck closed at start of heating cycle.
RESULT: High-stage pressure switch stuck closed at start of heating cycle.
CODE: E 9.
RESULT: High-stage pressure switch stuck open.
RESULT: High-stage pressure switch stuck open.
CODE: E A.
RESULT: Reversed 115 VAC polarity.
RESULT: Reversed 115 VAC polarity.
CODE: d 0.
RESULT: Data not yet on network.
RESULT: Data not yet on network.
CODE: d 4.
RESULT: Invalid memory card data.
RESULT: Invalid memory card data.
CODE: b 0.
RESULT: Blower motor not running.
RESULT: Blower motor not running.
CODE: b 1.
RESULT: Blower communication error.
RESULT: Blower communication error.
CODE: b 2.
RESULT: Blower HP mismatch.
RESULT: Blower HP mismatch.
CODE: b 3.
RESULT: Blower motor operating in power, temperature or speed limit.
RESULT: Blower motor operating in power, temperature or speed limit.
CODE: b 4.
RESULT: Blower motor current trip or lost rotor.
RESULT: Blower motor current trip or lost rotor.
CODE: b 5.
RESULT: Blower motor locked rotor.
RESULT: Blower motor locked rotor.
CODE: b 6.
RESULT: Over/under voltage trip or over temperature trip.
RESULT: Over/under voltage trip or over temperature trip.
CODE: b 7.
RESULT: Incomplete parameters sent to motor.
RESULT: Incomplete parameters sent to motor.
CODE: b 9.
RESULT: Low indoor airflow.
RESULT: Low indoor airflow.
CODE: C 1.
RESULT: Low-stage cooling.
RESULT: Low-stage cooling.
CODE: C 2.
RESULT: High-stage cooling.
RESULT: High-stage cooling.
CODE: L O.
RESULT: Low-stage heat.
RESULT: Low-stage heat.
CODE: H I.
RESULT: High-stage heat.
RESULT: High-stage heat.
CODE: F.
RESULT: Continuous fan.
RESULT: Continuous fan.
CODE: 1 2.
RESULT: CFM/100; Alternates with C1, C2, LO, HI, F.
RESULT: CFM/100; Alternates with C1, C2, LO, HI, F.
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!!
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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