Question about Heating & Cooling
Many times an "F" stands as a reminder the filter needs changed, the 12 in this case could be a date, amount of days, or the F12 could be a code of some kind all together different, send me the model and all info you can get off the thermostat and we will see what it is.
Posted on Nov 05, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
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