On Sunday, June 3, 2018 at 10:44:17 AM UTC-4, Lynda wrote:
Replaced my batteries in thermostat when low batteries flashed on the screen
but my air conditioner will not come on. Is there a reset required?

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Was it working before you replaced the batteries? Most have an indication
that the system is on, or you can hear a click when it closes a relay.
Any signs that it's doing that? What happens if you turn it up to call
for heat?