Honeywell T8131A Owner's Manual page 34

Cooling will not come on (Cont).
The house is too warm or too cool.
SYSTEM ON indicator is lit, but no
heat is coming from the registers.
If temperature setting is lower than current
temperature, and displays COOL, move system
switch from COOL to OFF for ten minutes. After
ten minutes, return switch to COOL position. If the
air conditioner comes on, compressor could have
reached its high limit temperature protection and
shut down. If the air conditioner does not come on
after ten minutes and displays COOL, contact
Honeywell Customer Assistance at 1-800-468-1502.
Press Present Setting key to check the current
temperature setting.
If desired, change the temperature setting. See
page 18.
Allow time for the furnace to heat up and the fan to
come on before checking for heat at the register.
(Check to make sure system on-time is set
correctly according to pages 20 and 21.)
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