Honeywell RTH8500WF Wi-Fi Series Quick Start Manual page 10

1.10 Switch heating/cooling system ON
Important!
1.10a Verify that the C
wire is connected at the
thermostat and at the
heating/cooling system.
1.10b Make sure the heating/cooling
system door is firmly secured.
1.10c Switch power back ON for
your heating/cooling system
at the breaker box or its
power switch.
Circuit
breaker
box
10
or
Heating/cooling
M31544
system power
switch