Luxaire Furnace Repair Guide
What’s Wrong With Your Luxaire Furnace?
| 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. |
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
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Luxaire Furnace Error Codes
| 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
Who Should You Call?
Luxaire’s Warranty Coverage
- 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
Discontinued Luxaire Furnace Models
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