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Question About Lennox International Inc. Thermostat 51M33
My Lennox 51M33 thermostat keeps switching from AC...

My Lennox 51M33 thermostat keeps switching from AC to heat on it's own. Also, recently the thermostat screen goes blank and the system shuts off. Any ideas?

Asked by Daniel on 08/22/2011 0  Answer

ManualsOnline posted an answer 13 years, 3 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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