Outdoor Temperature Sensor (Select Models); Troubleshooting Guide - Honeywell Tradeline Chronotherm IV Installation Instructions Manual

T8611G CHRONOTHERM
6. Press the Run Program key to exit the system-test.
The system-test times out after four minutes
without any key presses.

TROUBLESHOOTING GUIDE

Symptom
Display will not Thermostat is not being
come on. powered.
Temperature Room temperature display has
display is incorrect. been reconfigured.
Thermostat is configured for °F
or °C display.
Bad thermostat location.
The upper or lower temperature
Temperature
limits were reached.
settings will not
change. (Example:
Cannot set the
heating higher or
The setpoint temperature range
the cooling lower.)
stops were configured.
Heating will not No power to the thermostat.
come on.
Thermostat minimum off time is
activated.
System selection is not set to
Heat.
Heating setpoint is below room
temperature.
®
IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS
Possible Cause
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.
• Check for 24 Vac between R and C 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.
Enter Installer Setup number 37 and reconfigure the display.
Enter Installer Setup number 14 and reconfigure the display.
Relocate the thermostat.
Check the temperature setpoints:
• Heating limits are 40 to 90°F (4.5 to 32°C)
• Cooling limits are 48 to 99°F (7 to 37°C)
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
• Check for 24 Vac between R and C 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.
Wait up to five minutes for the system to respond.
Set system selection to Heat.
Check heating setpoint. Set heating setpoint to desired
temperature.
9
Action
(Continued)
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