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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

Excellent job. Excellent service. Competitive price. Its rare to find a company with the knowledge and professional results we have experienced with Twintech. The clean and neat installation with attention to detail and drop sheers to respect our property is a clear indication of Twintechs high level of integrity. The 1-1/2 gas line upgrade they did for our pool 3 years ago was awesome. Can't say enough. Thank-you Twintech.

by Private User on Twintech Heating and Cooling

Twitch did a great job with the installation of our new furnace. I really appreciated their honesty and I could trust what they were telling me. Another company tried to suggest significantly more work at a greater cost claiming it was necessary to meet current building code. Twintech is very fair. All staff I meet were friendly, polite and trustworthy. I would recommend Twitch for a furnace.

by Private User on Twintech Heating and Cooling

This is a professional team that's easy to deal with. I would strongly recommend them

by hj.taggart in OSHAWA on Twintech Heating and Cooling

Very professional firm from start to finish!
They removed the old oil tank and furnace. They installed air conditioning and a new propane furnace.
Professional installation, on time and no mess.
Very pleased with their work and would highly recommend the company. Our house is three stories so they spent the time to do all the calculations to make sure we would have great performance on each floor.
Thank you again!

by susieschoeppler in Oshawa on Twintech Heating and Cooling

Upon a routine yearly maintenance, it was discovered there was a leak in the heat exchanger and a I needed a new furnace. I know nothing about these things and was completely stressed out. The company I had the maintenance plan with quoted me a huge number to rent a furnace, I just wanted to cry. Then I spoke to Dave at Twintech. He was so knowledgeable and calming, provided me a fair quote and within a few days I had an amazing crew show up to my house and install my new energy efficient furnace! I have already recommended these wonderful people at Twintech to a good friend of mine. Thank you Twintech!!

by Private User on Twintech Heating and Cooling

Great service and great people to deal with, from sales to installer. I highly recommend this company.

by GR from Oshawa on Twintech Heating and Cooling

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!

by nathans in Scarborough on Twintech Heating and Cooling

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. I’ve 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.

by Private User on Twintech Heating and Cooling

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.

by Nancy in Toronto on Twintech Heating and Cooling

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