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Durham Region Air Conditioning Repair, Service and Installation

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The flashing LEDs on your furnace will correspond to a specific fault code that is shown here on this diagnostic chart.


CODE: Led Off
RESULT: No power to control or control hardware fault detected.

CODE: Heartbeat
RESULT: Control Powered - displayed during all modes of operation if no errors are detected.

CODE: 1 Flash.
RESULT: Reverse line voltage polarity.

CODE: 2 Flashes.
RESULT: impoper earth ground.

CODE: 3 Flashes.
RESULT: Burner failed to light, or lost flame during heat demand.

CODE: 4 Flashes.
RESULT: Low flame signal - check flame sensor.

CODE: 5 Flashes.
RESULT: Watchguard - burner failed to light, exceeded maximum number of retries or recycles.

CODE: 6 Flashes.
RESULT: Not used.

CODE: 7 Flashes.
RESULT: Primary or Secondary limit open or watchguard mode - limit switch open longer than 3 minutes.

CODE: 8 Flashes.
RESULT: Rollout switch open.

CODE: 9 Flashes.
RESULT: Pressure switch failed to closw or opened during heat demand.

CODE: 10 Flashes.
RESULT: Watchguard - Pressure switch opened 5 times during one heat demand.

CODE: 11 Flashes.
RESULT: Pressure switch stuck closed prior to activation of combustion air inducer.

CODE: 12 Flashes.
RESULT: Flame sensed without gas valve energized.

CODE: 13 Flashes.
RESULT: Low line voltage.


See What Our Customers Are Saying:

by Private User on Twintech Heating and Cooling

Flawless transaction. They did exactly what they promised, showed-up on time, cleaned-up, and were highly professional. Highly recommended.

by Bill Edmondson on Twintech Heating and Cooling

Salesperson and 2 man installation team were all professional and
knew their stuff. All three were friendly and helpful, answering all
my questions. The quality of their work demonstrated their experience
and expertise in their field.

by Private User on Twintech Heating and Cooling

A dear late cousin of mine recommended this company and I have been happy with the service.

by Private User on Twintech Heating and Cooling

We are very pleased with the work done by Twintech. They were very professional from start to finish. Dave came to our home and gave us a very competitive quote for new high efficiency furnace and air conditioner. The installers were very courteous and professional. We would highly recommend them.

by W1n5t0n1987! on Twintech Heating and Cooling

Great experience getting an old furnace replaced.
Sales Guy (Dave) was great - honest, responsive, and friendly.
The work itself was done quickly and we are very happy with the outcome, thank you! We recommend TwinTech!

by Private User on Twintech Heating and Cooling

This review is late coming so my apologies to the amazing Twin Tech team! I contacted Dave at Twin Tech for a quote this past Feb (as I was collecting a few) and his recommendation was excellent. From the first meeting with Dave to the team installing the new furnace, not once did i feel uncomfortable . The team were extremely professional yet personable and clean and tidy. Decent companies still exist!
The new furnace just purrs and its just amazing the difference it has made!
(PS my sibling ended up getting a furnace from them as well)

by Private User on Twintech Heating and Cooling

The service was Twintech was excellent.
Dave our salesperson was easy to talk to and was professional. The unit recommended meets our needs and budget.
Greg and his team arrived on time for the installation and even got rid of the garbage the contractors left in our furnace.
Would definitely recommend Twintech.

by Steve V, Toronto on Twintech Heating and Cooling

Our old water tank was installed in 1997. Wasn't working as well as it should so we looked into a tankless as it is more efficient and a space saver! we had used Twintech in the past for a furnace cleaning and were satisfied with that so we decided to ask for a quote for the changeover. Gary arrived and provided the options and the quote fit within our budget so we decide to go with them after receiving a few alternative quotes from other companies. They did what the said would be done and it was completed within a reasonable time frame! Removal and cleanup of the old tank was seamless. We are now enjoying consistent and efficient Hot water! I recommend Twintech and would use them for future projects!

by New AC Unit + Humidifier on Twintech Heating and Cooling

One of the most honest HVAC companies out there! Dave was very helpful and informative in helping us choose a new AC unit. While they weren’t the lowest quote, we went with them because we trusted Dave and he was the most honest guy out of the companies that quoted us.
Greg and his crew who installed the unit were very professional and did a great job. If I could do it over again I would choose Twintech again.

by Private User on Twintech Heating and Cooling

Relocated and replaced our air conditioning unit. Fast, professional, and high quality service. We would definitely use them again for future projects!