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Durham Region Air Conditioning Repair, Service and Installation

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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.

CODE: Slow amber flashing.
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.

CODE: Rapid red flashing.
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.

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.

CODE: Two red flashes.
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.

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.

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.

CODE: Six red flashes.
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.

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.

CODE: Nine red flashes.
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.


See What Our Customers Are Saying:

by Private User on Twintech Heating and Cooling

We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.

by Private User on Twintech Heating and Cooling

excellent crew, fast and efficient! Would call them again when I need a new furnace.

by Private User on Twintech Heating and Cooling

Professional, courteous and efficient, don’t need to say more than that! Use them you will not regret it.

by Private User on Twintech Heating and Cooling

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.

by Private User on Twintech Heating and Cooling

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!

by Private User on Twintech Heating and Cooling

I left a live chat message on their website that my air conditioning was not working. Within 1hr a representative called me to discuss my options.
The next day he came to the house to review my needs and give me a price for a new system. Price quoted was less than I expected and the installation was completed the following day. I found their salesman and the installers very knowledgeable and easy to deal with. All my questions were answered. Everything was properly explained in regards to what unit was needed and why, along with instruction where needed for use.
The installers made sure everything was working properly before they left.

by Samta Chanana on Twintech Heating and Cooling

This is to thank Twintech Heating and Cooling for their exceptional and timely service. Mitch, their technician was very courteous and generous with his time right from his first meeting with us. He not only took the time to check everything but also educated us on why we needed what he recommended. Greg and Mitch graciously accommodated us on our requested day and time for job to be done. They were both very courteous and responsive to our needs and special requests especially in a tight spot. The job was finished neatly and on time. Thank you Twintech for your great service !

by Private User on Twintech Heating and Cooling

They came the day and time they had planned for us and were very fast and efficient! The AC works amazing and it is amazing during the heat of the summer we have already got! Thanks for everything you did for us!

by Private User on Twintech Heating and Cooling

Would recommend this company to friends and family in a heartbeat. Very professional , on time and left no mess when the job was done.

by stefany on Twintech Heating and Cooling

Great customer service. Responsive and professional. I would highly recommend Twintech, I used them previously for repair service and a new air conditioner- very satisfied.