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This is a code saying the board has lost communication with the variable speed motor.
Instead of "talking" back and forth they no longer exchange data. Meaning ramp up/down, static pressure etc.
The motor is designed to run at different speeds depending on conditions...this is usually on the blower side with the module on rear of the motor...HOWEVER...to be 100% sure you would need an ecm motor tester to confirm
ECM = electronically commutated motor.
It has 115v constant power..but a varying signal of 24v is what determines speed.
An ecm motor tester is designed to hook to the motor and then control the motor from the tester.
A Lennox Dealer will have this tester....most are in the $500 range if you wish to buy one yourself.
here is a manual that may help you...I would share more but it gets pretty involved...it is hard to take what is taught in an entire semester and translate in this forum.
unfortunately these motors are very susceptible to power issues...brownouts, surges, spikes...and sometimes just a bad feedback.
If only 3 years old I would call a Lennox dealer as the motor should be under warranty.
Most have a minimum of 5 years parts..
The motor is only windings and bearings with magnets.....the part that goes bad 95% of the time is the module
This will depend the dealer, but generally yes.
This is a basic part in stock now....
And they should be able to bench test but will depend on shop manpower available.
I would call first to arrange. I know I have all qualified guys that could test on the service trucks...so you may want to schedule
Yes that is exactly what I do...
sorry, I am better with furnaces than computers...
excellent...just rate service at top of page to close for now. 30 day follow up after service is rated. I wish you the best