Honeywell T8131A Owner's Manual page 19

Heating will not come on (Cont).
Cooling will not come on.
Check the system fuse or circuit breaker and
replace or reset, if necessary.
Check for correct wiring and good connections.
If temperature setting is higher than current
temperature and displays HEAT, contact Honeywell
Customer Relations at 1-800-468-1502.
Check that the green LED is lit.
Check that the switch on the thermostat is set to
COOL.
Check the system fuse or circuit breaker and
replace or reset, if necessary.
Check for correct wiring and good connections.
The thermostat has a built-in time delay on cooling.
Allow five to ten minutes after changing the setting
before the air conditioner starts.
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