Troubleshooting Guide - Honeywell Chronotherm T8665A Installation Instructions Manual

TROUBLESHOOTING GUIDE

For troubleshooting, see Table 6.
Symptom
Display does not Thermostat is not being
come on. powered.
Temperature Room temperature display
display is has been reconfigured.
incorrect.
Thermostat is configured
for °F or °C display.
Poor choice of thermostat
location.
Temperature The upper or lower
settings do not temperature limits were
change. reached.
(Example:
The setpoint temperature
Cannot set the
range stops were
heating higher or
configured.
the cooling
lower.)
Heating does not Thermostat is calling for
come on. heat (flame icon is in
display).
Thermostat is not calling
for heat (no flame icon is in
display).
Thermostat minimum off
time is activated.
System selection is not set
to Heat.
Heating setpoint is below
room temperature.
Cooling does not Thermostat minimum off
come on. time is activated.
System selection is not set
to Cool.
Cool setpoint is above
room temperature.
Thermostat is calling for
cool (snowflake is in
display).
Thermostat is not calling
for cool (no snowflake icon
is in display).
System on Fan operation set for 0
indicator (conventional heat) when it
should be set for 1 (electric
( = heat,
heat).
= cool) is
Conventional heating
displayed, but no
equipment turns on the fan
warm or cool air
when the furnace has
is coming from
warmed up to a setpoint.
the registers.
Heating or cooling
equipment is not operating.
Thermostat Backlight may fade over
backlight the life of the batteries.
appears dim.
T8665A CHRONOTHERM® IV DELUXE PROGRAMMABLE WIRELESS THERMOSTAT
Table 6. Troubleshooting Guide.
Possible Cause
Check if batteries are present and installed correctly.
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 48 to 99°F (7 to 35°C)
Check Installer Setup numbers 34 and 35 and reconfigure the setpoint
stops.
• Troubleshoot the W8665 Receiver Module.
• Troubleshoot the heating equipment.
• Raise heating setpoint above room temperature.
• Check if the W8665 is set up to receive signals from this thermostat.
Wait up to five minutes for the system to respond.
Set system selection to Heat.
Check heating setpoint. Set heating setpoint to desired temperature.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off time
Set system selection to Cool.
Check cooling setpoint. Set cooling setpoint to desired temperature.
• Troubleshoot cooling equipment.
• Troubleshoot W8665 Receiver Module.
• Check if the W8665 is set up to receive signals from the thermostat.
Enter Installer Setup number 2 and reconfigure the fan operation.
Wait a minute after seeing the on indicator and then check the
registers.
Verify operation of heating or cooling equipment in self-test.
• Wait unit Replace Battery indicator is illuminated and replace
• Replace batteries now.
— If batteries are present and installed correctly, replace thermo-
stat.
— Set up W8665 to receive signals.
(if required).
— Set up W8665 to receive signals.
batteries.
11
Action
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