luxaire gas furnace troubleshooting

Luxaire Furnace Troubleshooting Problems

Luxaire has started its business back in the 50s, and they have been manufacturing gas furnaces for people in North America since then. Professionals at Luxaire are determined to manufacture furnaces that are reliable, energy effective and Energy Star certified. Luxaire furnaces bring numerous qualities to the table, and silent operation makes the selling point.

Furnaces are complicated appliances with sophisticated mechanisms and numerous components. Proper maintenance and professional servicing once a year will reduce the risk of malfunctioning. A luxury furnace not working correctly isn’t the best news for the winter, but the Luxaire furnace troubleshooting codes will help you understand the main problem.

What is the Luxaire fault code system?

Luxaire high-efficiency furnace troubleshooting is a lot easier thanks to the LED light codes. The furnaces come with built-in, self-diagnostic ability. When an issue develops, a blinking LED will display a fault code. The LED may flash red, green, or ambler to signal different situations. It’s placed behind a transparent viewport in the blower compartment door.

The control is supposed to monitor its functioning all the time and the operation of the whole system. Every time a failure develops, the LED will signal the failure code. When the failure is internal to the control, the light will remain on without stopping. You will have to replace the control since it’s not something to fix.

Flash sequence codes 1 through 10 are: LED will switch “on” for ¼ second and “off” for ¼ second. The model will repeat the number of times according to the code. A six “on” flashes mean a number 6 fault code. A 2-second “off” period will break every flash code sequence.  Keep reading for the details.

Slow green flash

It refers to the regular operation of your furnace.

Slow amber flash

The code signals regular operation when there’s a heat request.

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.

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. Miswiring or a defective pressure switch could cause the problem.

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, so replacing the control board is necessary.

60-minute automatic reset from lockout

The control comes with a circuit that resets from the lockout situation after one hour. It will reset the operational faults 6, 7, and 8. The mechanism ensures protection to the structure when a temporary issue is present and affects the furnace’s proper operation.

For example, a low incoming gas supply pressure affects proper operation, but its safety feature prevents furnace operation. Once the gas pressure is restored, the “watchdog” function will restart the furnace, heating the household.

When the flame is identified, the control will flash the LED for 1/8 of a second, activating a flame stabilization period afterward.

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