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Troubleshooting Guide - Honeywell Chronotherm IV T8600D Installation Instructions Manual

Deluxe programmable thermostats
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TROUBLESHOOTING GUIDE

Symptom
Display does 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.
Temperature
The upper or lower temperature
settings will not
limits were reached.
change. (Example:
Cannot set the
The setpoint temperature range
heating higher or
stops were configured.
the cooling lower.)
Heating does 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.
Cooling does not
No power to the thermostat.
come on.
Thermostat minimum off time is
activated.
System selection is not set to
Cool.
Cool setpoint is above room
temperature.
T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 6. Troubleshooting Guide.
Possible Cause
• 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.
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 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.
• Wait up to five minutes for the system to respond.
Set system selection to Heat.
Check heating setpoint. Set heating setpoint to desired
temperature.
• 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.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off
time (if required).
Set System selection to Cool.
Check cooling setpoint. Set cooling setpoint to desired
temperature.
11
Action
69-1409—1

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T8600d chronotherm iv