Honeywell 1-Heat/1-Cool - TH5110D1022 Large R Operating Instructions Manual page 21

If . . .
Cooling
system does
not turn on.
"Heat On" is
not shown in
the display.
69-1713
Troubleshooting Tips (Cont)
• Set the system to Cool by pressing the
System button.
• Check the cool temperature setting to be
sure it is set below room temperature
and "Cool On" shows solidly in the
display.
• Check the circuit breaker to be sure it is
not tripped.
• Check the power switch at the heating
and/or cooling system to be sure it is on.
• Check the furnace door to be sure it is
closed securely.
• Wait five minutes for the cooling system
to respond.
• If all of this was checked, contact your
local heating and cooling contractor.
Set System setting to Heat and set the
temperature setting above the room
temperature. If "Heat On" is shown solidly
in the display, but the heating system does
not turn on, see "Heating system does not
turn on" in Troubleshooting Tips.
Then . . .
21