Luxaire Furnace Repair Guide

Please note, the following Luxaire Repair guide is for informational purposes only. Any servicing you attempt is at your own risk.

➤ A complete Luxaire furnace repair guide, from how to replace your air filter, to troubleshooting and error codes, model numbers and more!

Luxaire got their start in Ohio back in the 1950s, and they’ve been manufacturing quality gas furnaces for North American homes ever since. Their dedication to home comfort includes manufacturing furnaces that are dependable, energy efficient and ENERGY STAR® certified, and among the quietest on the market.

But, to make sure you get the longest life possible from your furnace, it’s important to know about some basic maintenance tasks and be able to identify certain problems you might encounter during your furnace’s lifespan.

Today you’ll learn what you need to know about the maintenance and repairs that will keep your furnace functioning optimally for as many years as possible.

What's covered in this article?

What’s Wrong With Your Luxaire Furnace?

Like any mechanical device or appliance, furnaces sometimes malfunction or breakdown, and there are common issues that tend to surface over the years, including:

Is your furnace...	The problem might be your...	What's wrong?	How you can fix it:
Not heating?	Circuit Breaker/Fuse	Most likely, either the electrical system providing your furnace’s power has shorted or the power switch has blown.	Try resetting your furnace’s circuit breaker. If it has blown, you will need to replace it.
	Igniter	The furnace’s igniter might either be cracked or faulty.	Check the part for cracks, if it is then replace the igniter. If it isn’t cracked, use a multimeter to test for continuity.
Cycling irregularly?	Thermostat	Your thermostat might be adjusting incorrectly, causing the furnace to cycle on and off too often.	If your thermostat has an adjustable calibration scale, adjust the heat anticipator. If this does not stabilize the unit, you may have to replace the thermostat.
Not blowing hot air?	Blower Motor	Your blower motor may have completely burnt out. If this doesn’t seem to be the case, then the connecting belt may have simply broken.	Test to see if power is reaching the motor. If it does, but isn’t running, the motor has likely failed. If the motor runs but air doesn’t move, the connecting belt has probably broken. You’ll have to replace the belt.
Blowing too much air?	Control Board	The control board regulates the amount of voltage that reaches each functioning part. If the relay that controls the blower motor has failed, it will continually send voltage to the motor.	Replace the control board.
	Thermostat	The contact that controls the blower motor on your thermostat may be stuck closed, causing the blower motor to run continuously.	Use a multimeter to check for continuity. If it appears the thermostat is the issue, replace it.
Leaking water?	Drain Pipe
Starting and then stopping shortly after?	Flame Sensor	Your furnace’s flame sensor monitors the burner, detecting whether a flame is present. If it is either defective or dirty, it will not be able to detect a flame.	If dirty, clean the sensor using a fine abrasive pad. If faulty, replace the flame sensor.

Other common problems that you might encounter with your furnace include that it stops producing enough heat or stops working as efficiently as it should, and this usually means the air filter needs to be replaced.

In fact, you should replace your furnace filter every one to three months during the heating season, so here’s a step-by-step guide to help you with this task:

How to Replace Your Air Filter

Open the access panel or remove it, depending on your model
Check near the cold air intake to locate the old filter
Slide out the old filter
Line up the new filter using the arrows on the frame
Slide the new filter into place
Replace or close the access panel

Get Quotes

How soon are you looking to buy?*

Urgently!

Next few weeks

Not sure yet

Luxaire Furnace Error Codes

Most furnaces in Canada use LED light patterns to tell you when the furnace is functioning properly, when problems arise, and what those problems might be.

Being able to read these codes is an important part of keeping your furnace healthy, because the Luxaire furnace light codes will give you an idea of what maintenance is required and whether you need to call a technician.

Luxaire furnaces are equipped with an LED that will flash green, red, or amber depending on the problem, and here’s what those flash codes mean:

Luxaire Error Code	What this means	How to fix it
Slow green flash	It refers to the regular operation of your furnace.	N/A
Slow amber flash	The code signals regular operation when there’s a heat request.	N/A
Slow amber flash	The code signals regular operation when there’s a heat request.	N/A
Rapid red flash	The code informs about a twining error, wrong 24 V phasing.	It would help if you examined the wiring of the twining.
Rapid amber flash	The code warns that the flame sense current is under 1.5 microamps.	Examine and clean the flame sensor, but also take a look at the gas flow.
One red flash	The code informs that the flame was identified when there was no request for heat. In this code’s case, the control will switch on the inducer motor and the supply air blower. The issue occurs when a gas valve is leaking, or it’s slowly closing.	Miswiring or a defective pressure switch could cause the problem.
Two red flashes	When pressure switch contacts (typically open) are stuck in the closed position, the code two red flashes will appear. The control is confirming that the connections are open every time the heat cycle is initiating.
Three red flashes	Luxaire furnace error code 3 informs that pressure switch contact (typically open) didn’t close after the inducer became energized.	The blocked vent pipe, defective inducer, damaged pressure switch hose, or faulty pressure switch can generate this problem.
Four red flashes	Luxaire furnace four red flashes signify that an auxiliary/primary limit switch has opened its typically closed contacts. When this code develops, the control will run the inducer and the supply air blower.	Wrongfully sized duct system, dirty filter, wrongfully firing rate, improper blower speed setting, or defective blower motor make possible causes for the problem.
Five red flashes	The fault code shows that typically closed contact in the rollout switch is opened.	You may manually reset the rollout control. When it’s opened, you have to look for correct combustion air, primary exchanger heat exchanger failure, proper inducer operation, or burner issue. Don’t forget to reset the switch after addressing the failure situation.
Six red flashes	Luxaire furnace blinking red light six times means that the pressure switch opened four times throughout the heat request after the furnace operated. When the primary blower is in “delay on” mode, it will complete it, along with all subsequent delay-off periods. Expect the furnace to lockout for an hour and restart automatically afterward.
Seven red flashes	The fault code reveals that the flame wasn’t identified. The no-light condition has developed three times (two attempts) throughout the heat request before the furnace is locked out automatically.	Defective gas valve, low gas pressure, faulty hot surface ignitor, or burner issues could cause the problem. Once again, the furnace will lock out automatically, restarting afterward.
Eight red flashes	The code informs that the flame was lost five times (4 recycles) throughout the heating process.	A defective gas valve or low gas pressure could be the culprit. If that happens, the furnace locks out for an hour and restart on its own.
Nine red flashes	The code informs that the line voltage polarity is reversed; a grounding issue can also be the cause. The problem will affect both cooling and heating operations.	It would help if you saw the branch and furnace’s polarity and examine the furnace’s grounding. Don’t forget to determine if the flame probe isn’t shorted to the chassis.
Ten red flashes	When the gas valve is energized, but there was no heat request, the control will flash ten red flashes.	It would help if you examined the gas valve wiring and gas valve. An HVAC technician will investigate the problem.
11 red flashes	When an auxiliary or primary limit switch has opened the typically closed contacts, remaining open for more than five minutes, you will notice the 11 red flashes.	A defective blower wheel or faulty blower motor make the typical causes.
Steady on red	The code signals a control failure.	Replacing the control board is necessary.

When to call a professional to repair your Luxaire furnace

Now that you know what the various flash codes on your Luxaire furnace mean and the most common furnace issues that crop up, it’s time to go over which of these issues will require a diagnosis and repair by a certified technician.

Here’s a list of common furnace problems that will need a professional inspection: your furnace isn’t producing heat, isn’t blowing hot air, is blowing cold air or too much air in general, is making strange noises, is leaking, is cracked, won’t stay on, or smells like gas.

Who Should You Call?

Some furnace problems can be addressed with DIY maintenance, such as changing the filter and maybe even cleaning the flame sensor, depending on your comfort, skill, and knowledge level.

But for the problems that require a trained technician, you can use our partner program to find a certified HVAC company that’s been independently verified to be dependable, knowledgeable, and trustworthy.

Luxaire’s Warranty Coverage

Even if you do need to call in a technician to help with your furnace issues, there’s a good chance the repair, or at least the components, will be covered under your Luxaire warranty. Every furnace in their Acclimate, LX, and Comforteer series is covered by the following warranties:

One-year labor limited warranty
Five-year parts limited warranty (which extends to a 10-year warranty if you register a new furnace within 90 days of installation)
Lifetime heat exchanger warranty

Luxaire Furnace Model Numbers

LP9C

TM9V

LPLC

LP9C060B12MP12C
LP9C080B12MP12C
LP9C080C16MP12C
LP9C100C16MP12C
LP9C100C20MP12C
LP9C120D20MP12C

TM9V040A10MP11C
TM9V060B12MP11C
TM9V080B12MP11C
TM9V080C16MP11C
TM9V100C16MP11C
TM9V100C20MP11C
TM9V120D20MP11C

LPLC060A12MP12C
LPLC080B12MP12C
LPLC080C16MP12C
LPLC100C16MP12C
LPLC100C20MP12C
LPLC120C20MP12C

TM9T

TM9E

TG9S

TM9T060B12MP11
TM9T080B12MP11
TM9T080C16MP11
TM9T100C16MP11
TM9T100C20MP11
TM9T120D20MP11

TM9E040A10MP11
TM9E060B12MP11
TM9E080B12MP11
TM9E080C16MP11
TM9E100C16MP11
TM9E100C20MP11
TM9E120D20MP11

TG9S040A08MP11
TG9S060A10MP11
TG9S060B12MP11
TG9S080B12MP11
TG9S080C16MP11
TG9S080C22MP11
TG9S100C16MP11
TG9S100C20MP11
TG9S120D16MP11
TG9S120D20MP11
TG9S130D20MP11

TM9Y

TM9Y040A10MP11
TM9Y060B12MP11
TM9Y080B12MP11
TM9Y080C16MP11
TM9Y100C16MP11
TM9Y100C20MP11
TM9Y120D20MP11

Discontinued Luxaire Furnace Models

DCUC

G9T

G9D

DCUC-072N100
DCUC-072N125
DCUC-T090N165
DCUC-T090N205
DCUC-T102N165
DCUC-T102N205
DCUC-T120N205
DCUC-T120N245
DCUC-T150N205
DCUC-T150N245
DCUC-W090N165
DCUC-W090N205
DCUC-W102N165
DCUC-W102N205
DCUC-W120N205
DCUC-W120N245
DCUC-W150N205
DCUC-W150N245

G9T04010UPA13
G9T06010UPB13
G9T06012DHB13
G9T08012DHB13
G9T08012UPB13
G9T08016DHC13
G9T08016UPC13
G9T10014UPC13
G9T10020DHC13
G9T10020UPC13
G9T12020DHD13
G9T12020UPD13
G9T14020UPD13

G9D06012UPB11
G9D08012UPB11
G9D08016UPC11
G9D10014UPC11
G9D10020UPC11
G9D12020UPD11

TM9M

TM9X

TM9M060B12MP12
TM9M080B12MP12
TM9M080C16MP12
TM9M100C16MP12
TM9M100C20MP12
TM9M120D20MP12

TM9X060B12MP11
TM9X080B12MP11
TM9X080C16MP11
TM9X100C16MP11
TM9X100C20MP11
TM9X120D20MP11

Get Quotes

How soon are you looking to buy?*

Urgently!

Next few weeks

Not sure yet

What are you looking for?*

Luxaire Furnace Repair Guide | Troubleshooting, Error Codes & More