Honeywell Electronic Programmable Thermostat Owner's Manual page 13

Heating will not come on.
(Continued)
Cooling will not come on.
Check the system fuse or circuit breaker and replace or
reset, if necessary.
If display is blank or displays bAt Lo, install fresh
batteries.
If temperature setting is higher than current temperature,
and SYSTEM ON indicator is lit, contact your local
dealer.
Check that switch on thermostat is set to COOL. Allow a
minimum of five minutes for time-guard protection to
expire.
Check the system fuse or circuit breaker and replace or
reset, if necessary.
If display is blank or displays bAt Lo, install fresh
batteries.
The thermostat has a built-in time delay on cooling. Allow
at least five minutes after changing the setting before the
air conditioner starts.
Make sure outdoor disconnect is engaged (on).
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