we replaced the batteries on our thermostat after they began flashing for a few minutes. We'd been using the heater up to that point. After replacing the batteries, the heater does not turn on anymore. We can hear the click indicating it's trying but nothing is happening.
AC won’t turn on after replacing thermostat batteries
hvac
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Best Answer
If your thermostat requires you to remove it from the wall to replace the batteries, with a wall plate left affixed to the wall, then it sounds like you didn't properly reattach it to the wall plate. There will be electrical contacts between the two halves, often long pins, that need to properly align. A bent pin, incomplete attachment, dirt on the contacts, etc, can all result in the symptoms you describe.