Honeywell CHRONOTERM IV T8624D Installation Instructions Manual page 11

Deluxe zone multistage thermostat
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Symptom
The upper or lower
Temperature
temperature limits were
settings will not
reached.
change. (Example:
Cannot set the
heating higher or
The setpoint temperature
the cooling lower.)
range stops were
configured.
Heating will not
No power to the
come on.
thermostat.
Heating will not
Thermostat minimum off time
come on.
is activated.
System selection is not set
to Heat.
Heating setpoint is below
room temperature.
Cooling will not
No power to the
come on.
thermostat.
Thermostat minimum off time
is activated.
System selection is not set
to Cool.
Cool setpoint is above
room temperature.
System on indi-
Heating or cooling
cator (flame=heat,
equipment is not
snowflake=cool) is
operating.
displayed, but no
warm or cool air is
coming from the
registers.
Outdoor tempera-
Option not activated.
a
ture not displayed
Outdoor sensor is
Outdoor
connected incorrectly.
temperature
display is
Wrong sensor.
a
incorrect
a
Select models.
T8624D CHRONOTHERM
Troubleshooting Guide (Continued).
Possible Cause
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Check the temperature setpoints:
• Heating limits are 40 to 90°F (7 to 31°C)
• Cooling limits are 45 to 99°F (9 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 zone control
panel—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 C.
— 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 zone control
panel—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.
Verify operation of heating or cooling equipment in self-test.
Enter Installer Setup number 24 and set to 1. Thermostat must
have OT terminals and a C7089B1000 installed.
Refer to C7089B1000 installation instructions and check wiring
between the thermostat and sensor.
Replace sensor with C7089B1000 sensor.
11
Action
69-1074

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