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Hello, I need a brand name to go with that short model number. (most model numbers are a lot longer as well, look for that too).
I need a description of what you have, where all of the equipment is located will help.
We can go from there
Thanks, ***** ***** been in the business for 55 years, this is not a common failure, I have seen some less than fully reputable contractors sell a home owner a new printed circuit card every year... when the problem was actually a slow refrigerant leak, so all they did was add a little refrigerant.
Have you seen the failed cards up close your self, were you shown any burnt spots on them?
Have other of your homes electronic appliances suffered similar fates or just this Lennox unit.
Let me know, we can go from there.