$49 / month O.A.C Including Install
$49 / month O.A.C Including Install

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Durham Region Air Conditioning Repair, Service and Installation

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If you're looking for help fixing your tempstar furnace, look no further! Our comprehensive tempstar repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model's error codes.


CODE: Heartbeat LED pattern on solid.
RESULT: The control is locked out and will auto-reset after 1 hour.
FIX: Reset power to clear the lockout.

CODE: Two LED flashes.
RESULT: Pressure switch didn't open.
FIX: Obstructed pressure tubing; a pressure switch that's stuck closed.

CODE: Three LED flashes.
RESULT: The low-pressure switch did not close or has reopened.
FIX: Proper vent sizing; air leak; restricted vent; clogged condensate drain; low input gas pressure; excessive wind; improper pressure switch wiring; water in vent piping; disconnected or obstructed pressure tubing.

CODE: Four LED flashes.
RESULT: Limit circuit fault.
FIX: Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch.

CODE: Five LED flashes.
RESULT: Abnormal flame-proving signal.
FIX: Leaky gas valve; stuck-open gas valve.

CODE: Six LED flashes.
RESULT: Ignition proving a failure.
FIX: Low inlet gas pressure; control ground continuity; gas valve defect; defective hot surface igniter; oxide buildup on the flame sensor; inadequate flame carryover; flame sensor mustn't be grounded.

CODE: Seven LED flashes.
RESULT: Limit circuit lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #4.

CODE: Eight LED flashes.
RESULT: Gas heating lockout.
FIX: Gas valve stuck closed on control.

CODE: Nine LED flashes.
RESULT: Medium pressure switch, high-pressure switch, or PSR relay didn't close or was reopened.
FIX: Refer to status code #3.

CODE: Ten LED flashes.
RESULT: Polarity.
FIX: Correct line voltage polarity.

CODE: Status codes 1 + 2.
RESULT: Blower on after power up.
FIX: Normal operation.

CODE: Status codes 1 + 5.
RESULT: Blower motor lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #4 + 1.

CODE: Status codes 3 + 5.
RESULT: Gas valve fault.
FIX: RED, YELLOW, or ORANGE wire at the gas valve.

CODE: Status codes 4 + 1.
RESULT: Blower motor fault.
FIX: Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits.

CODE: Status codes 4 + 2.
RESULT: Inducer motor fault.
FIX: Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly.

CODE: Status codes 4 + 3.
RESULT: The low or medium pressure switch is open while the medium or high-pressure switch is closed.
FIX: Low inlet gas pressure; clogged condensate drain; improper pressure switch wiring; water in vent piping; low or medium pressure switch stuck open; disconnected or obstructed pressure tubing.

CODE: Status codes 6 + 1.
RESULT: Ignition lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #6.


See What Our Customers Are Saying:

by Jennifer in Toronto on Twintech Heating and Cooling

I had cold and hot spots all over my 70 yr old home. My furnace is quite new and Greg optimized the fan and furnace. The original installer just took it out of the box with factory settings and installed it- basically running at 50% of capacity. Greg also routed heat into my laundry room, yeah - so now I can renovate laundry room - thanks Greg. He is honest, professional and knowledgeable. I will be calling him back in the spring to optimize my AC as well.

by Happy Homeowner in Toronto on Twintech Heating and Cooling

Wonderful from beginning to end. I tend to fret and worry about home improvements but the excellent team at TwinTech put my mind as ease. They listen, they are patient and best of all ... the work they did is amazing! I chose the Goodman 80K BTU 2 stage furnace and the matching Goodman air conditioner. Greg, Grant and Poitr "Peter" arrived on time, took great care, explained everything to me and they answered all of my questions. They carefully adjusted the factory settings to optimize the furnace for my house and they also checked the duct work in the basement. Dave, the Sales Manager, came by to say "hello" and to see if I was happy. YES, I am happy with the work! The furnace is very quiet. I have it running on low just to circulate the air in the house and it's so much quieter than my old furnace. When I need new duct work for an upcoming basement renovation TwinTech will be my first choice. I highly recommend TwinTech. PS. They were even nice to my dogs.

by Les G. from Pickering on Twintech Heating and Cooling

Greg was prompt on the scheduled day of installation and the work was done well within the time estimated beforehand. Installation was neat and the equipment and scope of work was as specified in the quote. One item I must point out is that we were faced with a "No Heat" situation the day before the scheduled installation and Greg came out to address it free of charge. Not only that, but he also corrected an installation fault with our smart thermostat that was not part of the original job, again free of charge.

by one19 in North york on Twintech Heating and Cooling

Greg came by to do a routine furnace checkup. He was very knowledgeable and professional, letting me know what's being checked/adjusted and giving me tips to ensure everything runs smooth. Very honest and upfront about what's working fine vs. what may need to be fixed/replaced. He didn't attempt to up sell anything that wasn't necessary. I'm glad to have finally found someone I can trust and rely on for all my HVAC needs - furnace, A/C, and hot water tank.

by Paul M. from Toronto on Twintech Heating and Cooling

I'm very happy with the work that was done. Everyone from salesperson to the installers were friendly and professional. They were on time and cleaned up the job site after it was installed. They also answered all my follow up questions promptly. I wouldn't hesitate to work with them or recommend them again.

by Kathy D.in Ajax on Twintech Heating and Cooling

Thanks to the team at Twin Tech for a great job installing my new heat pump/ac unit. The guys were very polite and professional. When they left you would never have known they had been there except for the new Mitsubishi unit on the wall!! would highly recommend the Twin Tech team.

by varga p. in Pickering on Twintech Heating and Cooling

Installed professionally, no delays, no rework needed. Very reliable contractor and sales person. Also installed BBQ gas line and some duct work.

by Private User on Twintech Heating and Cooling

Greg and Grant are friendly, reliable, and knowledgeable HVAC professionals. The twins, Dave and the entire team provided efficient top quality service. Our family plns to use Twintech for all of our future HVAC needs.

by peter in Whitby on Twintech Heating and Cooling

Very impressed with this company. They show up on time , kept my place clean and after they left it looks like they were never there. Very professional team. Those people know what they doing . Their installation was on the highest standard. They are very knowledgeable especially they're worker Peter. I strongly recommend this company to everybody. After the installation I receive the call making sure I'm satisfied with their products and their job. Bravo!!!

by James in Bowmanville on Twintech Heating and Cooling

Greg and his brother were referred to us by a friend. They arrived when they said they would, did an exceptional job and left the place as tidy or tidier then they found it. Their professionalism is only surpassed by their kind and friendly demeanor. Even after several calls to help me with my high tech thermostat I feel that I could always call with any concern (No one responds to my texts as quickly as Greg) and have a friendly helpful response. I found out their grandfather started the company and now as a 3rd generation company, they are doing their grandfather proud. I would highly recommend Twintech over any other hvac company out there.

See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

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.

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  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - December 22, 2021

People commonly make New Year’s resolutions for things that concern their personal lives. This year, however, you might want to consider making resolutions that involve keeping your home a safe and enjoyable place from the outside world.Here are so

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  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - January 30, 2024

I can provide some general information that might help you evaluate the environmental impact of your Amana heat pump. Energy Efficiency: Heat pumps, including those made by Amana, are generally more energy-efficient than traditional heating

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Is Your HVAC System Making Your Home Dusty?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - December 15, 2018

We all know the struggle of cleaning your home from top to bottom only to wake up a few days later and notice that dust has already begun to accumulate once again. It’s an annoying process that keeps us continually reaching for the duster da

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Why Buy a Heat Pump For My Durham Home

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - April 27, 2025

When it comes to keeping your Durham Region home comfortable year-round, choosing the right HVAC system is crucial. One of the most efficient and versatile options available today is the heat pump. At Twintech Heating and Cooling, we believe a

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