Honeywell CHRONOTHERM T8600D Product Data page 18

T8600D, T8601D AND T8602D CHRONOTHERM
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.
Temperature The upper or lower temperature
settings will not limits were reached.
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.
Heating will not Thermostat minimum off time is
come on. activated.
System selection is not set to
Heat.
Heating setpoint is below room
temperature.
Cooling will 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.
68-0164—1
®
Table 12. Troubleshooting Information.
Possible Cause
• Check for 24 Vac between R and C or W terminals.
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 45 to 99°F (7 to 35°C) except D model cooling
Check Installer Setup numbers 34 and 35 and reconfigure the setpoint
stops.
• Setpoint is above room temperature.
• Check for 24 Vac between R and C or W terminals.
Wait up to five minutes for the system to respond.
Set system selection to Heat.
Check heating setpoint. Set heating setpoint to desired temperature.
• Setpoint is below room temperature.
• Check for 24 Vac between R or RC and C or Y terminals (D models
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off time (if
Set system selection to Cool.
Check cooling setpoint. Set cooling setpoint to desired temperature.
IV DELUXE PROGRAMMABLE THERMOSTATS
— 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.
limits are 48 to 99°F.
— 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.
requires power to R at all times).
— 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.
required).
18
Action
(continued)