trane furnace codes

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

CODE: Slow flashing LED light
PROBLEM: This means that your furnace is on, but it’s not calling for heat.
FIX: This is only an issue if you have raised your thermostat and your furnace doesn’t respond.

CODE: Rapidly flashing LED light
PROBLEM: Means that your furnace is on and is actively calling for heat.
FIX: Only beware this if your furnace is continuously calling for heat and isn’t responding to your thermostat.

CODE: Continuous LED on
PROBLEM: Control panel issue.
FIX: Replace the control panel.

CODE: Two LED flashes
PROBLEM: System lockout due to lack of flame or reversed polarity.
FIX: Check for miswiring, clogged pilot tube, or humidity in the unit.

CODE: Three LED flashes
PROBLEM: Draft pressure error.
FIX: Check if the drain tubes are full of moisture or obstructed with dirt.

CODE: Four LED flashes
PROBLEM: The furnace is experiencing an open temperature limit circuit issue.
FIX: The issue with thermal protection.

CODE: Five LED flashes
PROBLEM: A flame was sensed within your furnace that shouldn’t be present.
FIX: Check for a leaky gas valve, stuck gas valve, or defective flame sensor.

CODE: Six LED flashes
PROBLEM: AC power voltage is too low.
FIX: Correct line voltage polarity, check the wiring.

CODE: Seven LED flashes
PROBLEM: An issue with your gas circuit.
FIX: Check your unit’s gas valves for the issue.

CODE: Eight LED flashes
PROBLEM: Low Flame.
FIX: Check for flame sensor malfunction or low gas pressure.

CODE: Nine LED flashes
PROBLEM: Igniter circuit issue.
FIX: Check igniter.

trane furnace codes


What Our Clients Are Saying About Us

I would recommend KDM for sure

July 17, 2020

Dan was very friendly and polite from the start. Did exactly the work that we talked about on the phone, and was very quick making a late evening call on a Sunday. Tested all the joints and even painted the gas lines. I would recommend him for sure.

Colin JacobsCourtice, ON

I would recommend KDM for any of the services they provide

July 17, 2020

I had a 2nd hand pool heater hooked up and needed help getting it fired up. So I contacted Dan at KDM to see if they could help and was pleased he could make it over within a couple of days. He checked out the gas piping for leaks and proceeded to analyze the components of the control system and determined a faulty pressure switch was likely preventing operation. I was able to source the part and Dan was able to make a 2nd call within a day to install and complete the job. So in summary, I would recommend KDM for any of the services they provide.

Douglas PattersonWhitby, Ontario

KDM was hired for the Installation and relocation of internal gas line

July 17, 2020

KDM was hired for the Installation and relocation of internal gas line for my basement finishing project.

Paul AlisonOshawa, Ontario

Daniel and Steve were amazing, very professional work and courteous

July 17, 2020

Daniel and Steve were amazing, very professional work and courteous….never dealt with more friendly and knowledgeable Hvac technicians.

Rajshar MahomesMarkham, Ontario

I would not hesitate to hire Daniel and his crew again

July 17, 2020

Asked for quotes on a A/C and furnace after 17 years when the A/C unit broke down. I contacted a few HVAC contractors including KDM. Daniel could not have been more helpful and responsive and after reviewing the quotes decided to hire him for the job. Could no have made a better choice. Daniel was patient and upfront and answered all my questions when asked. He upgraded my A/C unit for the same price after the original unit we agreed upon was back ordered. The crew came when they said they would an completed the installation in a timely and orderly fashion.

I would not hesitate to hire Daniel and his crew again. In fact he is coming back to deal with another issue I have next month!

Job well done.

Ian DavidPickering, Ontario

I definitely recommend KDM Home & gas for others

July 17, 2020

I was looking for someone who can do the gas line connection on a weekend and I found the right guys with KDM Home & Gas. Daniel came on Sunday morning to do the work. He installed the new gas line, connected the new gas stove, confirmed no leaks and ensured everything works fine. It was a really hot day outside but he did an excellent job.


RajeevAjax, Ontario

Everything was quick and efficient

July 17, 2020

Assessment happened on a holiday and work was completed the following day. Everything was quick and efficient.
Thanks Daniel.

Chris SouthamWhitby, Ontario