T8601D CHRONOTHERM
®
IV DELUXE ZONE THERMOSTATS
11
69-1413—2
TROUBLESHOOTING GUIDE
Table 7. Troubleshooting Guide.
Symptom
Possible Cause
Action
Display does not
come on.
Thermostat is not being
powered.
• Check for 24 Vac between R and C terminals.
— If missing 24 Vac:
— verify that thermostat is correctly wired to the zone con-
trol panel.
— R on the thermostat to R on the TZ-3 and C to M1.
— R on the thermostat to R on the EMM-3U and C to C.
— verify the wiring between thermostat and zone control
panel.
— replace any broken wires and tighten any loose
connections.
— If 24 Vac is present, proceed with troubleshooting
Thermostat is not fully
connected to wallplate.
Verify that thermostat is correctly positioned and securely
latched to wallplate.
Temperature
display is incorrect.
Room temperature display has
been reconfigured.
Enter Installer Setup number 37 and reconfigure the display.
Thermostat is configured to °F
or °C display.
Enter Installer Setup number 14 and reconfigure the display.
Bad thermostat location.
Relocate the thermostat.
Temperature
settings do not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)
The upper or lower temperature
limits were reached.
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).
The setpoint temperature range
stops were configured.
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
Heating or cooling
does not come on.
No power to the thermostat
• Check for 24 Vac between R and C terminals.
— If missing 24 Vac:
— verify that thermostat is correctly wired to the zone con-
trol panel.
— R on the thermostat to R on the TZ-3 and C to M1.
— R on the thermostat to R on the EMM-3U and C to C.
— verify the wiring between thermostat and zone control
panel.
— 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 thermostat to respond.
Enter Installer Setup number 33.
Reconfigure the minimum off time, if required.
System selector is set to off.
Verify that the system selector is set for Heat, Cool or Auto.
Thermostat is not calling for
heat or cool.
Verify that the heat or cool icon (flame or snowflake) is present.
If not, raise or lower the setpoint to make a call for cool or heat.
System on indicator
(flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
Thermostat is not wired
correctly to the zone panel.
Verify wiring. Check if other zones can bring on the heat or cool.
Zone panel is not correctly
configured or wired properly.
If no zones can bring on the heat, verify equipment configuration
and wiring.
Outdoor
tempera-ture is not
displayed.
Option not activated.
Enter Installer Setup number 24 and set to 1. Thermostat must
have OT terminals and a C7089B1000 installed.
Outdoor
temperature display
is incorrect.
Outdoor sensor is connected
incorrectly.
Refer to C7089B1000 Installation Instructions and check wiring
between the thermostat and sensor.
Wrong sensor.
Replace sensor with C7089B1000 Sensor.
a
Available on select models.
69-1413-2.fm Page 11 Wednesday, July 13, 2005 10:07 AM
