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T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT
68-0197—1
11
TROUBLESHOOTING
Symptom Possible Cause Corrective Action
Heating/cooling
equipment does not
operate.
No ac power. Check power to heating/cooling equipment:
— On/Off switch.
— Fuse or circuit breaker.
— Loose 24V connection: at thermostat; at furnace/air
conditioner.
— Incorrect wiring: check appropriate wiring diagram.
Thermostat inoperative. See Checkout section.
Incorrect wiring. Check wiring.
Heating/cooling equipment
inoperative.
Consult equipment manufacturer instructions.
System switch on thermostat in
wrong position.
Reset System switch.
Flashing
Snowflake
Minimum-off timer in thermostat
operating for cooling.
Wait five minutes or follow steps in Checkout section.
Partial display. Still in installer setup mode. See Installer Setup section for instructions on how to exit.
Damaged thermostat. Replace thermostat.
Displaying only time
and not temperature.
Power to thermostat is currently
interrupted.
Check the power to thermostat.
Blank display. No power to thermostat. Check the power to thermostat.
Thermostat mounted incorrectly on
wallplate.
See installation instructions for correct mounting.
Temperature display
is incorrect.
Thermostat is configured
incorrectly for °F or °C.
Reconfigure display. See Installer Set-up for instructions to
change display.
Cannot change
temperature setting.
Upper or lower temperature
setpoints were reached.
Check temperature setpoints; temperature setting range is
40°F (4°C) to 99°F (37°C).
Time loss. Power to thermostat was
interrupted longer than 20
minutes.
Reset clock. See Setting The Clock