Most Frequent Lennox® Furnace Error Codes (and What They Mean)

While your Lennox® furnace cannot chat with you, it does have a way to tell you about a furnace error.

Its control board has twin LED lights that can display a fault code. Depending on the issue, your furnace might display continuous or flashing lights.

Though there are some elementary heating adjustments you can finish yourself, many services are best taken care of by the professionals. When your furnace refuses to kick on or put out warm air, get in touch with Winters Heating and Cooling at 317-406-5382 for expert furnace repair in Franklin & South Indy.

Our experts will swiftly pinpoint and fix the problem, even if you don’t have a Lennox furnace. We can fix whichever brands or models—and get the comfort reintroduced to your residence fast.

What Does the Blinking Light on My Heating System Mean?

Your furnace uses lights to flash code when it needs to be repaired. It also uses this system to relay it’s heating correctly.

Correct function involves:

Both lights flash slowly—heater working correctly.
Simultaneous fast flash—heating system is starting to call for heat.

If you see a single light flashing slowly and the other going on and off fast, your heater could be experiencing a low flame signal. This can happen even when your furnace is running like it should. It signifies the flame sensing rod could need to be cleaned or in the wrong spot on the burner. Reach out to us at 317-406-5382 for support.

Here are some of the most common issues for Lennox furnaces.

Heating System Will Not Start

Here are a few of the light patterns you could see when your heat won’t turn on or keep operating. The majority of these problems have to be repaired by a technician, like one from Winters Heating and Cooling.

All LED lights are off. This indicates your furnace might not have power. Look at the breaker box to ensure the heater fuse hasn’t triggered. Try resetting the fuse if it is in the “off” spot. If it rapidly flips after a subsequent reset, leave the breaker alone and contact us at 317-406-5382.
An individual light is unchanging and the other is flickering slowly. This shows the flame rollout switch is may be malfunctioning. The component is an essential safety device that helps in preventing fires and carbon monoxide. You shouldn’t attempt to handle this fault on your own.
An individual light is blinking rapidly and the other is flashing slowly. This likely indicates power polarity has been inverted. Your furnace could have a wiring problem that requires expert help from Winters Heating and Cooling.
The duo of lights are blinking slowly. This indicates your furnace’s blower motor possibly isn’t working. This piece distributes heated air from the HVAC system into your house. We can assist in pinpointing what’s wrong with this part.
One light is flickering slowly and the other is flickering fast. This indicates your heating system might have not enough voltage or a short circuit. Call our professionals at 317-406-5382 for assistance.
One light is blinking on, on and off while the other flashes on, off, on. This means there could be trouble with your furnace’s motherboard or wiring. Winters Heating and Cooling can locate the error and take care of it.
The duo of lights are using alternating slow flashes. This signifies your HVAC system may have a flame problem. There may be an issue with its gas supply, gas valve or ignitor control. Get in touch with us at 317-406-5382 for support.
A single light flashes slowly while the other remains steady. This often signifies your HVAC system’s limit switch is not working. The switch keeps your HVAC system from becoming too warm. Contact the experts at Winters Heating and Cooling for help.

Heater Blower Works But No Warmth

Here’s what might be wrong when you hear your furnace’s blower fan running, but you aren’t gaining any warm air.

Both lights display alternating rapid flickers. This means your furnace ignitor might not be working. This piece ignites energy in your HVAC equipment to produce warm air and should be serviced by a professional from Winters Heating and Cooling.

Trust Us for Professional Furnace Repair

When you need to have your heater fixed quickly, depend on the specialists at Winters Heating and Cooling. Our pros will repair the problem promptly and have your residence feeling comfortable again soon. Get in touch with us at 317-406-5382 or contact us online to request an appointment now.