Health and Safety Update - March 17th, 2020

trane furnace error codes

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trane furnace error codes
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trane furnace codes

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


If you have a Trane furnace, then you have one of the most reliable heating systems in existence. However, even the most reliable furnace runs into problems from time to time, and this is why your Trane has included several error codes to help you find a given issue. However, if you're unfamiliar with error codes for furnaces, then you may be unaware of what these codes mean.


To get peace of mind, it's important that you take a look at typical Trane furnace error codes to you learn what these error codes mean so you can get your system the service it needs.


CODE: Flashing Slow
RESULT: Normal no call for heat.
FIX: This is only an issue if you have raised your thermostat and your furnace doesn't respond.

CODE: Flashing Fast
RESULT: Normal call for heat.
FIX: Only beware this if your furnace is continuously calling for heat and isn't responding to your thermostat..

CODE: Continuous On
RESULT: Control panel issue.
FIX: Replace Control Panel.

CODE: Continuous Off
RESULT: Check Power.
FIX: Check Power.

CODE: 2 Flashes
RESULT: External Lockout (Retried or recycles exceeded).
FIX: Check for miswiring, clogged pilot tube, or humidity in the unit.

CODE: 3 Flashes
RESULT: Pressure Switch error.
FIX: Check if the drain tubes are full of moisture or obstructed with dirt.

CODE: 4 Flashes
RESULT: Open high limit device.
FIX: The issue with thermal protection.

CODE: 5 Flashes
RESULT: Flame sensed when NO flame should be present.
FIX: Check for a leaky gas valve, stuck gas valve, or defective flame sensor.

CODE: 6 Flashes
RESULT: 115 VAC power reversed polarity or poor grounding.
FIX: Correct line voltage polarity, check the wiring.

CODE: 7 Flashes
RESULT: Gas Valve circuit error.
FIX: Check your unit's gas valves for the issue.

CODE: 8 Flashes
RESULT: Low Flame sens signal.
FIX: Check for flame sensor malfunction or low gas pressure.

CODE: 9 Flashes
RESULT: Check Igniter.
FIX: Check igniter.

trane furnace error codes

trane furnace codes


See What Our Customers Are Saying:

by Rita, Scarborough on Twintech Heating and Cooling
We were so pleased with their service

When our old oil furnace finally broke down we decided it was time to finally convert to natural gas and finally install central air conditioning at the same time. Knowing it was going to be a significant investment for us, we wanted to make the right choice. Twintech came highly recommended by a friend and we were not disappointed. From the first contact with the salesperson, until the final touches on the installation, we were so pleased with their service. Everyone from the company was so friendly, efficient and a pleasure to deal with. Best of all, the cost was very competitive. We would certainly recommend Twintech to anyone requiring HVAC work in their home.

by Bob S, Pickering on Twintech Heating and Cooling
We found him to be friendly, conscientious & he left the work area clean!

Mitch from Twintech came out for our annual furnace inspection. We found him to be friendly, conscientious & he left the work area clean. We were also very impressed with the thoroughness of the job he did. This is the 2nd job we’ve had Twintech do for us & have been very happy with the results for each. We highly recommend this company. Thank you, Mitch, Dave & Greg.

by Brent L on Twintech Heating and Cooling
Very happy with the end result!

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
They stand by their products and are a pleasure to deal with!

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
Within a couple of hours, we had a new unit up and running!

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
I'm so glad I decided to go with Twintech!

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
What was promised, was delivered at a cost-effective price point.

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

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
Proud to support this local company

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
Arrived on time worked very efficiently and were very clean

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.

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trane furnace error codes