$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 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.

by dianeramsden on Twintech Heating and Cooling

Our air conditioner failed. Made a call and within 15 min a technician was at our door.
The issue was fixed and many suggestions were provided.
Thanks to Mitch. Great service !

by Kazuko on Twintech Heating and Cooling

Our furnace was rattling, as soon as we put our air conditioner on this past week. We had researched looking for a company that was Registered with Better Business Bureau, and this company TwinTech, had A+ Rating. Scott, was immediately helpful via text/phone and sent his technician as soon as he was able...Mitchell/technician provided great professional service. Thank you TwinTech.
Sean and Debbie

by ANOOP on Twintech Heating and Cooling

I contacted various companies when looking to install a new furnace and I found Twintech to be transparent with their communication and approach. They had options to suit my various requirements and the price vs quality was very good. The after installation communication was also very good and they answered all queries I had.

by Private User on Twintech Heating and Cooling

My furnace broke down last month. The team was quick to respond, courteous, professional and mindful of COVID-19 concerns. I highly recommend them if you are considering replacing or servicing your HVAC equipment.

by Private User on Twintech Heating and Cooling

I was very happy with the installation and price. I would definitely recommend. Thank you Twintech.

by Dorothy on Twintech Heating and Cooling

Had furnace and air conditioning unit put in. They did an excellent job great price and everything clean as can be, I was very pleased

by Barry on Twintech Heating and Cooling

All winter I have had an issue with very little heat reaching the 2nd floor of our home. After this past winter ended I decided to look into this. I found Twintech Heating and Cooling on line and started the process. After explaining my problem I had a call form Twintech and the tech came out and walked through things with me. The problem was the heating vent pipe had been dropped down in size by someone years ago causing little heat reaching the 2nd floor. Further into checking out the older furnace and AC they found a few things not properly installed by the last install of the old furnace and also that the AC was on it's last legs. I asked for a quote and waited a few days and we decided to go ahead with Twintech. They called a few days before to set up an installation time and date. The day of the install the guys were a half hour early which was a plus. The day of the install was great, the guys worked away removing the old furnace and AC.After which they installed the new furnace and AC. After they cleaned up the basement with all their tools and scrap metal etc. they came back inside to walk thru what they did. They also tested both the furnace and cooling systems to make sure everything worked and I the customer was happy. I now have heat on the 2nd floor for next winter. The guys from Twin tech were very professional. Their work habits and knowledge of the job was excellent. Their workmanship was just excellent, it was just up there with my standards as a homeowner. I am very pleased to have chosen Twintech for my new furnace and AC.. If I had to rate this experience with Twintech this company is a 10 in my books.Product,workmanship and customer care says it all.

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.

Does a Furnace Reduce its Efficiency as it Ages?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - February 9, 2024

Yes, a furnace can experience a reduction in efficiency as it ages. Several factors contribute to this decline. Wear and Tear: Over time, the components of a furnace, such as the heat exchanger, blower motor, and igniter, can wear out or become

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How Long Can My AC Run Before Breaking?

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - May 28, 2024

The lifespan of an air conditioning (AC) unit and how long it can run continuously without breaking depends on several factors, including the type and quality of the unit, how well it is maintained, the conditions in which it operates, and usage patt

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Common Mistakes When Getting a New Furnace

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - March 20, 2025

Here are some common mistakes people make when getting a new furnace, and how to avoid them: Choosing the Wrong Size A furnace that's too big will cycle on and off frequently, leading to uneven heating and higher energy bills. Too smal

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Unusual Noises From Furnace

  • SUBMITTED BY:
  • TWINTECH HEATING & COOLING
  • - November 28, 2024

If you’re hearing unusual noises from your furnace, it could signal a problem that needs immediate attention. Here's a guide to some common noises and their potential causes: 1. Banging or Popping Cause: This often indicates delaye

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