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69-1567
9
T8602C CHRONOTHERM
®
IV DELUXE PROGRAMMABLE THERMOSTATS
(continued)
CHECKOUT
Outdoor Temperature Sensor
(Select Models)
Allow the outdoor temperature sensor to soak in the
outdoor air for a minimum of five minutes before taking
a reading.
TROUBLESHOOTING GUIDE
Symptom Possible Cause Action
Display will not
come on.
Thermostat is not being
powered.
• Check if batteries are present and installed correctly.
— If batteries are present and installed correctly, replace
thermostat.
Temperature
display is incorrect.
Room temperature display has
been reconfigured.
Enter Installer Setup number 37 and reconfigure the display.
Thermostat is configured for °F
or °C display.
Enter Installer Setup number 14 and reconfigure the display.
Bad thermostat location. Relocate the thermostat.
Temperature
settings will not
change. (Example:
Cannot set the
The upper or lower temperature
limits were reached.
Check the temperature setpoints:
• Heating limits are 4.5 to 32°C
• Cooling limits are 7 to 37°C
heating higher or
the cooling lower.)
The setpoint temperature range
stops were configured.
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
Heating will not
come on.
No power to the thermostat. • Check for 24 Vac between R and W terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the power switch on the HVAC equipment
is in the Off position—set to the On position.
— check wiring between thermostat and HVAC
equipment—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Thermostat minimum off time is
activated.
Wait up to five minutes for the system to respond.
System selection is not set to
Heat.
Set system selection to Heat.
Heating setpoint is below room
temperature.
Check heating setpoint. Set heating setpoint to desired
temperature.