Durham Region Air Conditioning Repair, Service and Installation
If you're looking for help fixing your coleman furnace, look no further! Our comprehensive coleman furnace repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model's error codes.
CODE: Slow green flashing.
RESULT: Coleman furnace is operating normally.
FIX: N/A.
RESULT: Coleman furnace is operating normally.
FIX: N/A.
CODE: Slow amber flashing.
RESULT: Normal operation with a call for heat.
FIX: N/A.
RESULT: Normal operation with a call for heat.
FIX: N/A.
CODE: Steady on red.
RESULT: There's a control failure.
FIX: Check Control Unit.
RESULT: There's a control failure.
FIX: Check Control Unit.
CODE: Rapid red flashing.
RESULT: There's a twinning error with incorrect 24V phasing.
FIX: Check the twinning wiring.
RESULT: There's a twinning error with incorrect 24V phasing.
FIX: Check the twinning wiring.
CODE: Rapid amber flashing.
RESULT: There's a low flame sense current.
FIX: Check and clean the flame sensor. If it's still an issue, check for proper gas flow.
RESULT: There's a low flame sense current.
FIX: Check and clean the flame sensor. If it's still an issue, check for proper gas flow.
CODE: One red flash.
RESULT: A flame's present with the gas turned off.
FIX: Check the gas valve. It could be leaky or slow closing.
RESULT: A flame's present with the gas turned off.
FIX: Check the gas valve. It could be leaky or slow closing.
CODE: Two red flashes.
RESULT: Pressure switch is stuck in the closed position.
FIX: Check if there is a faulty pressure switch or miswiring.
RESULT: Pressure switch is stuck in the closed position.
FIX: Check if there is a faulty pressure switch or miswiring.
CODE: Three red flashes.
RESULT: Pressure switch is stuck in the open position.
FIX: Check if there is a faulty inducer, a blocked vent pipe, a broken pressure switch hose, or a faulty pressure switch.
RESULT: Pressure switch is stuck in the open position.
FIX: Check if there is a faulty inducer, a blocked vent pipe, a broken pressure switch hose, or a faulty pressure switch.
CODE: Four red flashes.
RESULT: Limit switch is stuck while open.
FIX: Check for a a dirty filter, an improperly sized duct system, an incorrect blower speed setting, or a faulty blower motor.
RESULT: Limit switch is stuck while open.
FIX: Check for a a dirty filter, an improperly sized duct system, an incorrect blower speed setting, or a faulty blower motor.
CODE: Five red flashes.
RESULT: Rollout switch is stuck while open.
FIX: The rollout control is manually reset. Therefore, if it has opened, then check to see if the inducer is operating properly or there is an issue with the primary heat exchanger.
RESULT: Rollout switch is stuck while open.
FIX: The rollout control is manually reset. Therefore, if it has opened, then check to see if the inducer is operating properly or there is an issue with the primary heat exchanger.
CODE: Six red flashes.
RESULT: Pressure switch cycle has locked out.
FIX: The furnace will lockout for one hour and then reset.
RESULT: Pressure switch cycle has locked out.
FIX: The furnace will lockout for one hour and then reset.
CODE: Seven red flashes.
RESULT: There's an ignition lockout due to too many retries.
FIX: The flame couldn't be established, check for a faulty gas valve, a dirty or defective flame sensor, a faulty hot surface ignitor, or a problem with the burner.
RESULT: There's an ignition lockout due to too many retries.
FIX: The flame couldn't be established, check for a faulty gas valve, a dirty or defective flame sensor, a faulty hot surface ignitor, or a problem with the burner.
CODE: Eight red flashes.
RESULT: There's an ignition lockout due to repeated power recycles.
FIX: Check if there is low gas pressure, a dirty or defective flame sensor, or a faulty gas valve.
RESULT: There's an ignition lockout due to repeated power recycles.
FIX: Check if there is low gas pressure, a dirty or defective flame sensor, or a faulty gas valve.
CODE: Nine red flashes.
RESULT: There's a grounding or line polarity issue.
FIX: Check the polarity at both the furnace and branch.
RESULT: There's a grounding or line polarity issue.
FIX: Check the polarity at both the furnace and branch.
CODE: Ten red flashes.
RESULT: Gas continues to flow with no call for heating.
FIX: Check on the gas valve and the gas valve wiring.
RESULT: Gas continues to flow with no call for heating.
FIX: Check on the gas valve and the gas valve wiring.
See What Our Customers Are Saying:
Jul 3, 2022
Great service and great people to deal with, from sales to installer. I highly recommend this company.
Apr 28, 2022
Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!
Apr 28, 2022
We wanted to get our AC replaced as it was 22-years old and added to this our furnace was costing more and more to repair. So, we decided to get both the furnace and AC replaced.
After going through a few quotes and product reviews we decided to go with Twintech. The three-men crew arrived early in the morning, wasted no time and got to work right away. By 2:00 pm, they were all done. Ive found their work to be top notch and they were completely professional. I had all my questions answered to my satisfaction both during the progress of their work and at end.
I have pleasure in recommending Twintech to anyone who is looking to get their furnace or Ac replaced
Nathan S.
Apr 28, 2022
Our air conditioner died On a Saturday and within hours Dave came out to take a look and discuss replacement/repair options.
The new air conditioner was installed on the Wednesday. The new unit was installed quickly. The installers were friendly and cleaned up afterwards.
We noticed a slight leak around the furnace that night and they came out the next day and fixed the issue. It has been working great and is quieter than our previous unit.
Very satisfied and would highly recommend TwinTech.
Apr 28, 2022
I contacted TwinTech to replace my 20-year old A/C. Dave, their service rep, promptly replied and was at my home within 2 hours. He was friendly and knowledgeable and didn't try to upgrade or oversell their A/C units but suggested the best fit for my small 1000 feet bungalow. Although this was during a heatwave and very busy, they were able to fit me in 2 days later. The TwinTech crew installed a 1.5 ton Ducane A/C unit that is now running smoothly while maintaining a constant cooling temperature. The crew were very courteous, professional and efficient and I will definitely recommend TwinTech to family and friends. I much appreciated your great service.
Nancy M., Oshawa
Apr 28, 2022
We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.
Apr 28, 2022
excellent crew, fast and efficient! Would call them again when I need a new furnace.
Apr 28, 2022
Professional, courteous and efficient, dont need to say more than that! Use them you will not regret it.
Apr 28, 2022
TwinTech was a pleasure to deal with from the estimate through installation. We replaced a 28 year old a/c unit with one recommended by TwinTech's sales representative Dave who took the time to go over the product with us and answer any questions. The warranty is for 10 years parts and labour and they will complete the registration for you. Installation was by Greg (owner) and Mitch and Spencer who were quick and efficient and left everything clean and tidy.
Apr 28, 2022
Very professional, from the sales consultation and inspection to the final installation. Met every expectations we had for the job. A local business with great client support. We highly recommend. Twintech is a blue chip! Thanks!
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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