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Durham Region Air Conditioning Repair, Service and Installation

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Rheem furnaces are all equipped with an advanced 7-segment diagnostic display you can use as a guide if something goes wrong with your heating system. Unlike many other furnaces, Rheem ones don't use flashing LED light sequences to indicate errors, and the display will instead give you a simple code you can use for diagnostics. For instance, 0 means the unit is in standby, while H means the heat is on.


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


CODE: Error Code 10.
RESULT: There's a one-hour lockout in place.

CODE: Error Code 11.
RESULT: The ignition failed.

CODE: Error Code 12.
RESULT: Low flame detected.

CODE: Error Code 13.
RESULT: The flame was lost.

CODE: Error Code 14.
RESULT: There was an unexpected flame.

CODE: Error Code 20.
RESULT: There was a twinning fault.

CODE: Error Code 22.
RESULT: Problem with high limit.

CODE: Error Code 26.
RESULT: Reversal of line and neutral.

CODE: Error Code 33.
RESULT: Roll-out switch problem.

CODE: Error Code 55 / 57.
RESULT: Pressure switch issue.

CODE: Error Code 58 / 59.
RESULT: Water or condensation problem.

CODE: Error Code 61.
RESULT: Problem with the blower.

CODE: Error Code 93.
RESULT: Problem with the control.


See What Our Customers Are Saying:

by Brent L on Twintech Heating and Cooling

Work was done on schedule, professionally, according to quote and with minimal inconvenience to building users. Very happy with the end result. The only area for improvement from my experience - need more timely quoting process.

by Karen on Twintech Heating and Cooling

The team was great! Very knowledgeable, professional and extremely helpful. A few days after install the unit didn’t seem to be working, user error, but within minutes of contacting them..on a Saturday.. a tech was on the phone troubleshooting with us. I highly recommend Twintech for your cooling or heating needs. They stand by their products and a pleasure to deal with.

by Rob on Twintech Heating and Cooling

During the hottest week in the summer our old A/C decided to call it quits. I called Twintech Heating & Cooling after receiving a referral from a family member; came highly rated for being an honest, family-run business, who appreciates their customers. Dave was able to accommodate my hectic schedule and book a late evening appointment to walk through the specifics. Greg and Mitch arrived exactly on time a few days later, were very polite and friendly, and within a couple of hours had a new unit up and running. I also received a follow-up call to ensure we were happy with the Amana.

by Linda Robinson on Twintech Heating and Cooling

They were on time and very professional. I'm so glad I decided to go with Twintech, thanks!

by Famcam1953 on Twintech Heating and Cooling

Timely and appreciated - this was during the hottest days this year when our Air and Furnace way.
Efficient. Professional. No BS or overselling. What was promised, was delivered at a cost-effective price point.
Down to earth.

by DG Sellers on Twintech Heating and Cooling

Professionally done and took care to cover all entry floors to the house for the installers to remove the old furnace and install a new furnace.
I also made recommendations of the tankless water heater that we had installed and items to address. We did not know they also installed tankless water heaters.

by Bill, Pickering on Twintech Heating and Cooling

Price was not the cheapest nor the most expensive of my quotes. It's the quality of the installation that makes for a good AC system. The twins' knowledge & professionalism was evident in the small details:
Very clean work. Greg made sure that the refrigerant level & temperature were correct. They reinstall the insulation & vapor barrier around the wall. The outside electrical cords were secured to the wall. Proud to support this local company. Thank you.

by Taz on Twintech Heating and Cooling

Great team of guys came to do the work. Very professional. Arrived on time worked very efficiently and were very clean. They answered any questions we had without hesitation. The air conditioner works great and is so quiet. I highly recommend them and they don't try to up-sell anything right from the start.

by Jordan on Twintech Heating and Cooling

The service was prompt, professional and very courteous. Competitive price. Would highly recommend this company.

by David on Twintech Heating and Cooling

Excellent workmanship, and quick response. Would recommend Twintech to anyone.