Changing Filters is important, but...

Changed filter but A/C won't run

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The digital thermostat said to change the filter and the A/C would not run. So I turned the dial to "filter" which turns the thermostat off, changed the filter, then set it back to "run." It still says "change filter" and still will not run. I cut off the power supply to the thermostat hoping it would reset and would work again, but that didn't work. I'm not sure what else to do. The thermostat still works, and the A/C ran just fine prior to the "change filter" indication on the thermostat. Please help!


Air Conditioning Problems

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The "Change Filter" function on your thermostat is just a timer, it has nothing to do with the operation of your system. You may have a battery operated thermostat that will still operate when the unit has no power, so start from scratch.
Check your breakers then go to your furnace switch or disconnect, then proceed to your control circuitry (fuse on PC board or trasformer there are several different things to check but do not be distracted by the change filter light.