Lennox furnace error code 401

Lennox is a popular brand of furnaces and their error codes are useful for diagnosing common problems.

In this article, we will be discussing Lennox Error Code 401. A 400 series error code indicates a problem with the flame sensor. If the homeowner has recently switched to natural gas and the furnace was previously using propane, it may be due to the system being unable to detect that there is no longer any carbon monoxide available for sensing. A 401 error code is typically less dangerous than a Furnace Error Code 400 and can mean that there are some minor problems in the blower section of your furnace.

A Lennox furnace error code 401 is a general indication that the control board is not communicating with the furnace. There are many causes for this problem to occur, such as defective wiring or an overabundance of power interruptions. If a new installation has been done recently, the installer may have incorrectly wired or configured something. An error code 401 is when the thermostat gets stuck in a certain mode. To fix this, you must turn off the furnace and unplug it before plugging it back in.

If you’re not a Lennox customer, then you need to find out what type of furnace error code 401 is causing your problem so that you can troubleshoot it properly.

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