Trane Comprehensive Troubleshooting for Your Thermostat

		XT302C DELUXE PROGRAMMABLE HEAT-COOL THERMOSTAT
TROUBLESHOOTING (Continued).
Symptom	Possible Cause	Action
Heating will not come	No power to the	Check for 24 Vac between R and W terminals.
on.	thermostat.	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
		connections.
		If 24 Vac is present, proceed with troubleshooting.
Heating will not come	Thermostat minimum off	Wait up to five minutes for the system to respond.
on.	time is activated.
	System selection is not	Set system selection to Heat.
	set to Heat.
	Heating setpoint is below	Check heating setpoint. Set heating setpoint to desired temperature.
	room temperature.
Cooling will not come	No power to the	Check for 24 Vac between R and W terminals.
on.	thermostat.	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 connections.
		If 24 Vac is present, proceed with troubleshooting.
	Thermostat minimum off	Wait up to five minutes for the system to respond. Enter Installer Setup
	time is activated.	number 39. Reconfigure minimum off time (if required).
	System selection is not	Set system selection to Cool.
	set to Cool.
	Cool setpoint is above	Check cooling setpoint. Set cooling setpoint to desired temperature.
	room temperature.
Heating or cooling	Heat or cool circuit is	Add resistor in parallel with load or install interface relay.
come on momentarily	opening up or becoming
and shut off	high impedance.
System on indicator	Heating equipment turns	Wait a minute after seeing the on indicator and then check the registers.
(flame=heat,	on the fan when the
snowflake=cool)	furnace has warmed up
displays, but no	to a setpoint.
warm or cool air is	Heating or cooling	Verify operation of heating or cooling equipment in self-test.
coming from the	equipment is not
registers.	operating.
Outdoor temperature	Option not activated.	Enter Installer Setup number 24 and set to 1. Thermostat must have OT
not displayed		terminals and a TAYSENS100A installed.
or is incorrect.	Outdoor sensor is	Refer to TAYSENS100A installation instructions and check wiring
	connected incorrectly.	between the thermostat and sensor.
	Wrong sensor.	Replace sensor with TAYSENS100A sensor.
	Filter expired.	Refer to the Filter Indication section in the Owner’s Guide, Pub.
		No. 22-5127-04
System on indicator	Filter expired.	Refer to the Filter Indication section.
reads Filter and
backlight is flashing.
Time displaying digits	Internal memory failure.	Contact distributor or retailer.
as three E’s (EEE).

Pub. No. 18-HD25D7-5

11 69-1213—1 (T8624)