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Question About Lennox International Inc. Thermostat L21 Eletronic Thermostat
I've got a Lennox L21 7-day programmable thermosta...

I've got a Lennox L21 7-day programmable thermostat and the screen goes blank for awhile then comes back on. This happens when the heating or cooling system in on or off. Why would it do this?

Asked by Fernando on 01/15/2013 1  Answer

ManualsOnline posted an answer 11 years, 10 months ago

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

Fernando posted an answer 11 years, 10 months ago

0 I would like to add that when the system is on and the screen goes blank, the system remains on.
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