Troubleshooting Guide - Honeywell Chronotherm IV T8601D Installation Instructions Manual

TROUBLESHOOTING GUIDE

Refer to Table 6 for troubleshooting information.
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.
Bad thermostat location.
Temperature The upper or lower
settings do not temperature limits were
change. reached.
(Example: Cannot
The setpoint temperature
set the heating
range stops were
higher or the
configured.
cooling lower.)
Heating does No power to the thermostat. • Check that C terminal is connected to the system transformer.
come on.
Thermostat minimum off
time is activated.
System selection is not set
to Heat.
Heating setpoint is below
room temperature.
Table 6. Troubleshooting Guide.
Possible Cause
• Check that C terminal is connected to the system transformer.
• 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 HVAC equipment—
replace any broken wires and tighten any loose connec-
tions.
—If 24 Vac is present, proceed with troubleshooting.
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.
• Check for 24 Vac between R and 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 connec-
tions.
—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.
11
Action
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