Troubleshooting Guide - Honeywell T8601D Installation Manual

TROUBLESHOOTING GUIDE

Symptom
Display does not Thermostat is not being
come on. powered.
Thermostat is not fully
connected to wallplate.
Temperature Room temperature display has
display is incorrect. been reconfigured.
Thermostat is configured to °F
or °C display.
Bad thermostat location.
Temperature The upper or lower temperature
settings do not limits were reached.
change. (Example:
Cannot set the
The setpoint temperature range
heating higher or
stops were configured.
the cooling lower.)
Heating or cooling No power to the thermostat
does not come on.
Thermostat minimum off time is
activated.
System selector is set to off.
Thermostat is not calling for
heat or cool.
System on indicator Thermostat is not wired
(flame=heat, correctly to the zone panel.
snowflake=cool) is
Zone panel is not correctly
displayed, but no
configured or wired properly.
warm or cool air is
coming from the
registers.
Outdoor Option not activated.
tempera-ture is not
displayed.
Outdoor Outdoor sensor is connected
temperature display incorrectly.
is incorrect.
Wrong sensor.
a
Available on select models.
Table 7. Troubleshooting Guide.
Possible Cause
T8601D CHRONOTHERM
• 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
Verify that thermostat is correctly positioned and securely
latched to wallplate.
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 (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:
— 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
Wait up to five minutes for the thermostat to respond.
Enter Installer Setup number 33.
Reconfigure the minimum off time, if required.
Verify that the system selector is set for Heat, Cool or Auto.
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.
Verify wiring. Check if other zones can bring on the heat or cool.
If no zones can bring on the heat, verify equipment configuration
and wiring.
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
®
IV DELUXE ZONE THERMOSTATS
Action
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