carrier furnace codes

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

Rapid LED flashing – Line voltage polarity is reversed.
If twinned, refer to twinning kit instructions.

Error Code 1-1 – No previous code
Stored status codes are erased when power to control is interrupted.

Error Code 1-2 – The blower is on after power up
Blower runs for 90 seconds if the unit is powered up during a call for heat.

Error Code 1-3 – Limit or flame roll-out switch lockout
Control will auto-reset after 3 hours. Reset the switch or replace the fuse link.

Error Code 1-4 – Ignition lockout
Control will auto-reset after 3 hours.

Error Code 2-1 – Gas heating lockout
Control won’t auto-reset. Check for either a badly-wired gas valve or a defective control.

Error Code 2-2 – Abnormal flame-proving signal
Flame is proved while the gas valve is de-energized. Check for either a leaky or stuck-open gas valve.

Error Code 2-3 – Pressure switch didn’t open
Check for an obstruction in the pressure tubing or a pressure switch that is stuck closed.

Error Code 2-4 – Secondary voltage fuse is open
Check for a short circuit in the secondary voltage wiring.

Error Code 3-1 – Pressure, draft safeguard, aux-limit switch, or blocked vent switch didn’t close (or reopened, downflow only)
If open for longer than 5 minutes, the inducer will shut off for 15 minutes before retry. Check for: low inducer voltage; proper vent sizing; defective inducer motor; defective blower motor or capacitor; defective pressure switch; restricted vent; excessive wind, inadequate combustion air supply; or obstructed pressure tubing.

Error Code 3-3 – Limit or flame roll-out switch is open
If the switch is open for longer than 3 minutes, the code will change to #1-3. Flame roll-out switch requires manual reset. Check for: defective blower motor or capacitor; dirty filter or restricted duct system; loose blower wheel; faulty switch or connections; or inadequate combustion air supply.

Error Code 3-4 – Ignition proving failure
Control will try three more times before lockout #1-4 will occur. If the flame signal is lost after the trial for ignition period, the blower will come on for a 90 second recycle delay. Check for: build-up on the flame sensor; proper microamp distribution to the flame sensor; defective gas valve or turned off gas valve; faulty hot surface ignitor; low inlet gas pressure; the manual valve is shut-off; continuity of control ground; low flame carryover or rough ignition; ungrounded flame sensor.

carrier furnace codes

What Our Clients Are Saying About Us

I would recommend KDM for sure

June 11, 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

June 11, 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

June 11, 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

June 11, 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

June 11, 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

June 11, 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

June 11, 2020

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

Chris SouthamWhitby, Ontario