Lennox Furnace Error Codes: A Comprehensive Guide For Troubleshooting Your Furnace

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When your furnace breaks, it’s usually during the coldest and most inconvenient time possible. For example, when you have a house full of guests or are in the middle of a cold snap with snow on the way. It’s at times like these that you need to be able to troubleshoot the problem quickly and effectively. If your furnace has error codes or lights, they will provide you with an indication as to what is causing the issue. The initial light indicator shows whether there is a problem or not. If that light comes on, then there is also an indicator of what exactly is wrong with your furnace. Different kinds of error codes could show up on your furnace. In this article, we are going to cover all of them in detail so that if you get any of these codes again, you can troubleshoot them effectively and efficiently.

Error Code 1

The first kind of error code that we’re going to cover is the E1 error code. This error code is going to indicate that there is a problem with the gas pressure in your furnace. This can be due to a faulty pressure switch, a broken or disconnected pressure regulator, or a gas supply issue. If you see this error code, you also want to check your pilot light to make sure it is lit and burning normally. If you don’t have a pilot light, then your furnace could be equipped with a standing pilot. If that’s the case, there will be an indicator to let you know. If the E1 error code is accompanied by the flashing red light, then you may also have a gas supply issue. If you have recently had work done on your furnace or a gas line, you should check your furnace manual to see if there is a reset button that needs to be pushed.

Error Code 2

The next error code that we’re going to cover is the E2 error code. This error code is normally due to a problem with the fan motor. This can be due to low voltage, a problem with the cooling system, or a problem with the circuit board. If the E2 error code is accompanied by the flashing red light, then the problem is the cooling system. If the E2 error code is accompanied by the steady red light, then the problem is the circuit board. If the error code is accompanied by the flashing red and yellow lights, then there is a problem with the cooling system and the circuit board.

Error Code 3

The E3 error code indicates that there is a problem with the gas valve. You can troubleshoot this by making sure that your gas valve is clean and free of any debris or obstructions. If it is clogged up, it could cause issues. If the E3 error code is accompanied by the flashing red light, then the problem is with the gas valve. If the E3 error code is accompanied by the steady red light, then there is a problem with the gas valve.

Error Code 4

The E4 error code indicates that there is a problem with the circuit board. This can be due to a problem with the wiring, a shortage in the furnace, or a faulty furnace thermostat. If the E4 error code is accompanied by the flashing red light, then the problem is the wiring. If the E4 error code is accompanied by the steady red light, then there is a short in the circuit board. If the E4 error code is accompanied by the steady red and yellow lights, then there is a problem with the wiring and the thermostat needs to be reset.

Error Code 5

This error code indicates that there is something wrong with the limit switch. This could be due to a problem with the wiring or the furnace shutoff switch. If the E5 error code is accompanied by the flashing red light, then the wiring is the problem. If the E5 error code is accompanied by the steady red light, then there is a problem with the shutoff switch.

Error Code 6

The E6 error code indicates that there is a problem with your furnace thermostat. This could be due to poor wiring, a loose connection, or a bad thermostat. If the E6 error code is accompanied by the flashing red light, then the problem is the wiring. If the E6 error code is accompanied by the steady red light, then the thermostat is the problem. If the E6 error code is accompanied by the steady red and yellow lights, then there is a problem with the wiring and the thermostat is the problem.

Error Code 7

The E7 error code indicates that there is a problem with your furnace circuit board. This could be due to a shortage in the wiring, a bad circuit board, or a faulty furnace thermostat. If the E7 error code is accompanied by the flashing red light, then the wiring is the problem. If the E7 error code is accompanied by the steady red light, then the circuit board is the problem. If the E7 error code is accompanied by the steady red and yellow lights, then there is a problem with the wiring and the circuit board.

Error Code 8

The E8 error code indicates that there is a problem with the furnace blower. This could be due to a clogged blower motor, a faulty circuit board, or a problem with the wiring. If the E8 error code is accompanied by the flashing red light, then the blower motor is the problem. If the E8 error code is accompanied by the steady red light, then the circuit board is the problem. If the E8 error code is accompanied by the steady red and yellow lights, then there is a problem with the blower motor and the circuit board.

Error Code 9

The last error code we’re going to cover is the E9 error code. The E9 error code indicates that there is a problem with the gas supply. You can troubleshoot this by making sure that the gas supply line is not clogged. If the E9 error code is accompanied by the flashing red light, then the problem is the gas supply line. If the E9 error code is accompanied by the steady red light, then there is a problem with the gas supply line. If the E9 error code is accompanied by the steady red and yellow lights, then there is a problem with the gas supply line and the circuit board.

Conclusion

Error codes can be a real pain, but they can also provide you with a lot of useful information if you know what to look for. If you ever find yourself staring at one of these codes, don’t panic. Instead, take a few deep breaths, check the furnace manual, ask a friend or family member for help, or call the furnace repair company. At least now you’ll know what you’re looking for