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Orange Light On Furnace (Reasons & Solutions)

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Many home appliances have life spans. When some exhaust theirs, they begin to give off signs for you to change them. The furnace isn’t left out of such appliances.

Furnace light changes colors to help you determine the condition of the furnace at that particular time. 

A furnace in good working condition often gives off blue light once turned on and remains so.

However, they’re other times the furnace light may change to other colors. One of the most common colors furnace lights change to is Orange color. 

The orange light indicates that your furnace is faulty and in a bad working condition. Also, it implies a dirty flame sensor and gas flow shortage which needs to be examined by a technician. Before the arrival of your technician, do not try to dip anything into the burner holes in an attempt to clean. If you dip anything in the burner holes, you might end up causing more damage.

What Does the Yellow Light on My Furnace Mean?

Orange Light On Furnace (Reasons & Solutions)

Yellow light on furnaces means that the burner is dirty and has a low gas pressure, reducing moisture.

Additionally, it could mean that your furnace is in high fire mode, which would make it run high continuously.

After that, the room will become uncomfortable for the occupants and reduce the furnace efficiency.

What Are The Codes On a Furnace?

Goodman 80,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES960803BN

The codes on a furnace include the furnace error codes such as the 2,3&22 flash error codes and then code 13 and code 21 etc.

Codes on furnaces have different meanings depending on the type of the furnace brand, but most furnaces have the same language. 

These codes come in the form of using blinking lights from the furnace to determine the error in the furnace. Also, a self-diagnostic system that the furnace possesses aids in finding this out.

Meanwhile, before assessing your furnace error code, find the LED light, observe its flashing routine and write it down.

Then, try to calculate the number of times the flashes occur and the rate at which the blinking occurs.

This calculation is because the number of blinking indicates an error code that applies to the problem.

#1. 3 Flash Error Code

This error normally occurs when the induced draft engine that needs to be at rest is working, and the vent system refuses to close during air pressure combustion. 

Causes of 3 Flash Error Code

  • Low airflow pressure from defective inducer.
  • Clogged vent pipe.
  • Punched pressure switch hose.
  • Faulty pressure switch.

A solution to 3 Flash Error Code

  • Firstly, open the pressure switch circuit and verify that the induced fan engine that regulates the air pressure is in good condition. You’ll observe airflow from the heat exchanger. But, without the airflow, you’ll have to replace the entire furnace engine completely.
  • However, if the fan engine is fine, the three flash error codes may occur due to a faulty connection in the Furnace Control Board. Thus, you’ve got to restore the connection and replace damaged parts if required.
  • If the above isn’t the cause, then you’ll need to employ a professional technician to examine your furnace and mend the issue.

#2. 2 Flash Code

This signal happens when your furnace blinks twice rapidly, and it signifies that your furnace is blowing cold air. Meanwhile, your furnace cannot generate a flame to keep you warm.

Also, a hard flame rod and dirty flame sensor could cause this. Consequently, contact a professional immediately to restore your furnace to normalcy once this occurs. 

#3. 22 Flash Error Code

22 Flash Error Code means that your furnace blinks rapidly for 22 times which further means there is a dangerous issue.

Also, this implies that there is a problem with the flame blazing and with the furnace.

Therefore, once a situation arises, ensure to switch off your furnace completely and have a professional look at it immediately. 

#4. Code 21

This furnace error code means that the high limit switch that detects the quantity of air pressure turns over. This condition occurs due to a dirty flame sensor or faulty pressure switch.

Therefore, gently cleaning the furnace condenser regularly, especially when this occurs. Also, change the pressure switch circuit when the code persists after regularly cleaning up the condenser.

#5. Code 13

This happens when the high limit switches lockout and turn over, stopping gas flow to the burner. A clogged air vent could also result in code 13 on a furnace.

Thus, frequently clean your flow vent and contact a technician to resolve the code 13 issue fully.

Flame Color Meanings in Furnace

You can determine if your heating system burns efficiently and without danger with the color showing while the flame burns.

Also, the color and the pattern at which the furnace burns are also important factors to analyze regularly. Contact a professional to examine your furnace when it starts reflecting any color other than blue.

Below are the meanings of most colors that a furnace radiates:

#1. Blue

This is the safest and most efficient flame color you need on your furnace, indicating that your furnace is operating perfectly. Any color other than blue is a signal that there is something wrong with the furnace.

#2. Yellow

This color means that the furnace will only work on high heat without taking a break, thus overheating the room.

Usually, a furnace is meant to work gently for 15 mins before switching to high fire mode. However, when your furnace flame reflects yellow, it won’t work typically and will only work at high speed. 

#3. Green

Green-colored flashes mean that the furnace is stuck in low fire mode, which won’t make it heat the room properly.

Thus, when the furnace has a green flame, it will only heat up very low, which is not efficient for cold climate days.

#4. Orange 

This color means that the furnace burner is dirty and not generating the correct amount of gases and oxygen. 

#5. Red

Red flashes indicate that your furnace lacks sufficient gas to maintain a consistent flame burning.

This could result from a mucky filter and barrier chamber, damaged burner, or high combustion chamber pressure. 

How Do You Reset the Code on a Furnace?

Suburban 2504ABK Nt-20Seq Furnace

You can reset the code on your furnace by just turning the pressure switch circuit near the furnace door down.

Meanwhile, after you’ve turned off your thermometer and furnace, you wait for some seconds before flipping it upward. Then you put your furnace back on, which will reboot it to reset mode.

Resetting the code if your heating system is the DIY solution to alleviate any issue in your furnace without a technician.

It is simple and won’t take less than 20-25 minutes to finish the resetting procedure.

Below is the step-by-step process of resetting the code on your furnace:

  1. Firstly, switch off the furnace thermostat and wait for a little while.
  2. Next, locate the furnace pressure switch circuit on either the right/left side or inside the furnace blower motor.
  3. Then turn over the circuit breaker that powers your heating system and wait 30 seconds for it to reboot.
  4. Afterward, turn over the circuit breaker to switch it on. Also, power on the thermometer and reset it to a suitable temperature.
  5. Contact your professional furnace service providers subsequently to examine and service the furnace.

Note: You can ease whatever issue your furnace has by rebooting/resetting its system before your professional gets to you.


The orange light on the furnace implies that it’s dirty or a gas production shortage is needed to function correctly. However, blue flame and sometimes orange are the safest you should have in your furnace.

Therefore, once you observe any furnace-colored flashes aside from the blue flame on your heating system, you should hurriedly contact a professional.

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