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Honeywell T8600D - Chronotherm IV Manual

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T8600D, T8601D AND T8602D CHRONOTHERM
®
IV DELUXE PROGRAMMABLE THERMOSTATS
68-0164—1
18
(continued)
Table 12. Troubleshooting Information.
Symptom Possible Cause Action
Display will not
come on.
Thermostat is not being
powered.
• Check for 24 Vac between R and C or 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.
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 40 to 90°F (4.5 to 32°C)
• Cooling limits are 45 to 99°F (7 to 35°C) except D model cooling
limits are 48 to 99°F.
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.
• Setpoint is above room temperature.
• Check for 24 Vac between R and C or 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.
Heating will not
come on.
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.
Cooling will not
come on.
No power to the thermostat.
• Setpoint is below room temperature.
• Check for 24 Vac between R or RC and C or Y terminals (D models
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.
Thermostat minimum off time is
activated.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off time (if
required).
System selection is not set to
Cool.
Set system selection to Cool.
Cool setpoint is above room
temperature.
Check cooling setpoint. Set cooling setpoint to desired temperature.
… 18 …


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  • The AC is not working. The repair person via a phone call said to turn off the system. How do I do this?
    I read the Manuel.
    The fuse is fine.
    Submitted on 28-7-2022 at 20:15

    Reply Report abuse

  • An HVAC repair person cannot come until next week. The AC is not working.
    He suggested I turn off the system. How do I do this? I read the manuel.
    It is not a problem with the fuse. Submitted on 28-7-2022 at 20:11

    Reply Report abuse


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