Troubleshooting Tips - Honeywell 1-Heat/1-Cool - TH5110D1022 Large R Operating Instructions Manual

If . . .
Display is
blank.
Temperature
settings do
not change.
Heating
system does
not turn on.

Troubleshooting Tips

• Check circuit breaker to be sure it is not
tripped.
• Check power switch at heating and/or
cooling system to be sure it is on.
• Check furnace door to be sure it is
closed securely.
• If you use batteries, check that fresh
AAA alkaline batteries are installed as
marked on the battery holder.
Check that the temperature settings are:
• Heating 40°F to 90°F (4.5°C to 32°C).
• Cooling 50°F to 99° F (10°C to 37°C).
• Set the system to Heat by pressing the
System button.
• Check that the heat temperature setting
is set above the room temperature and
"Heat On" shows solidly in the display.
• Check the circuit breaker to be sure it is
not tripped.
• Check 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 heating system
to respond.
• If all of this was checked, contact your
local heating and cooling contractor.
Then . . .
20 69-1713