Top Lennox® Furnace Error Codes (and What They Mean)

December 06, 2019

While your Lennox® furnace isn’t able to speak to you, it does have a process to tell you about a furnace error.

Its control panel has double LED lights that can share a fault code. Depending on the failure, your furnace could use steady or flashing lights.

While there are various simple furnace repairs you can take care of on your own, the majority of tasks are best taken care of by the professionals. When your heating system won’t kick on or put out warm air, get in touch with SchagrinGAS Company at 302-231-1380 for professional furnace repair in Middletown.

Our technicians will speedily discover and take care of the problem, even if you don’t use a Lennox heating system. We can service all types or makes—and get the comfort restored to your home fast.


What Does the Flashing Light on My Heater Mean?

Your furnace relies on lights to flash code when it is malfunctioning. It also works this setup to relay it’s heating correctly.

Normal function consists of:

  • Concurrent slow flash—heater working properly.
  • Concurrent fast flash—furnace is beginning to call for heat.

If you see a single light going on and off slowly and the other going on and off fast, your heater may be having a low flame signal. This can occur even when your heater is operating correctly. It signifies the flame sensing rod may have build-up or in the bad spot on the burner. Call us at 302-231-1380 for support.

Here are some of the most typical errors for Lennox furnaces.

Furnace Won’t Kick On

Here are a few of the light sequences you may notice when your heating system refuses to or keep heating. The majority of these problems need to be repaired by an expert, such as one from SchagrinGAS Company.

  1. The duo of LED lights aren’t lit. This means your HVAC system might not be receiving power. Find the breaker box to make sure the heating system fuse hasn’t tripped. Try resetting the fuse if it has moved into the “off” position. If it immediately turns off after a subsequent reset, don’t try to reset it again and contact us at 302-231-1380.
  2. An individual light is continuous and the other is blinking slowly. This signifies the flame rollout switch is likely open. The switch is a critical safety device that helps in preventing fires and carbon monoxide. You shouldn’t seek to handle this problem yourself.
  3. An individual light is blinking fast and the other is flickering slowly. This typically means power polarity has been transposed. Your heating system could have a wiring error that requires professional support from SchagrinGAS Company.
  4. Both lights are blinking slowly. This signifies your furnace’s blower motor possibly isn’t operating. This component distributes hot air from the furnace into your residence. We can assist in figuring out what’s causing a problem with this piece.
  5. A single light is blinking slowly and the other is flickering rapidly. This indicates your HVAC system may have low voltage or a short circuit. Call our specialists at 302-231-1380 for help.
  6. One light is blinking on, on and off while the other flickers on, off, on. This signifies there could be a problem with your heating system’s control panel or wiring. SchagrinGAS Company can find the problem and fix it.
  7. Both lights display alternate slow blinks. This indicates your heater possibly has a flame error. There could be trouble with its gas supply, gas valve or ignitor control. Get in touch with us at 302-231-1380 for help.
  8. One light flashes slowly while the other is continuous. This often signifies your furnace’s limit switch is open. The switch keeps your furnace from overheating. Call the pros at SchagrinGAS Company for assistance.

Heater Blower Works But No Warmth

Here’s what may be broken when you notice your heater’s blower fan working, but you aren’t gaining any warmth.

  • Both lights are giving alternate quick flickers. This indicates your furnace ignitor could not be working. This piece kindles gas in your HVAC equipment to create heat and should be fixed by a specialist from SchagrinGAS Company.

Depend on Us for Professional Furnace Repair

When you have to have your heater in working order quickly, depend on the specialists at SchagrinGAS Company. Our pros will handle the problem promptly and have your residence feeling cozy again in no time. Call us at 302-231-1380 or contact us online to request an appointment right away.