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:
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!
Intermittent Igniter Issues (natural gas, Armstrong Air Ultra V)
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - March 26, 2023
Here's the sitch.I've replaced my igniter 3-4 times in the last year. Figured I'd just gotten cheap ones. Maybe I got oil on it, maybe chemicals/moisture from nearby washing machine/shower (there's talk of this online, idk). Anyway, I bought a beefie
Read MoreMy AC is Not Blowing Cold Air
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - May 7, 2024
There could be several reasons why your air conditioner isn't blowing cold air. Here are a few common issues and troubleshooting steps: Thermostat Settings: Make sure your thermostat is set to "cool" mode and the temperature is
Read MoreCommon Ways Your AC Might Break Down
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - May 18, 2024
Air conditioning systems are essential for maintaining comfort in hot weather, but they can encounter various issues that lead to breakdowns. Understanding the common causes of AC failures can help you take preventive measures and ensure timely repai
Read MoreFurnace: Upgrade to a Smart Thermostat
- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - February 9, 2025
Upgrading to a smart thermostat for your furnace can improve efficiency, comfort, and energy savings. Here’s why you should consider making the switch: Benefits of a Smart Thermostat for Your Furnace ✅ Energy Efficiency – Smart th
Read More