Trane TAYSTAT 375, Quick Start Manual

Page: 9 / 12

69-1592–1
9
MULTISTAGE ELECTRONIC THERMOSTAT
Pub. No. 18-HD28D1-1
TROUBLESHOOTING GUIDE
a
Available on select models.
(continued)
Symptom Possible Cause Action
Display does not
come on. Thermostat is not being
powered. • Check that B terminal is connected to the system
transformer.
• Check for 24 Vac between B and R 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 connections.
— If 24 Vac is present, proceed with troubleshooting.
Temperature
display is incorrect. Room temperature display was
reconfigured. Enter Installer Setup Number 37 and reconfigure the display.
Thermostat is configured for ° F
or
°
C display.
a
Enter Installer Setup Number 14 and reconfigure the display.
Bad thermostat location. Relocate the thermostat.
Temperature
settings will not
change. (Example:
Cannot set the
The upper or lower temperature
limits were reached. Check the temperature setpoints:
•
Heating limits are 55 to 85
°
F (13 to 29
°
C)
• Cooling limits are 65 to 99 ° F (18 to 37 ° C).
heating higher or
the cooling lower.)
The setpoint temperature range
stops were configured. Check Installer Setup mode numbers 34 and 35 and
reconfigure the setpoint stops.
Heating does not
come on. No power to the thermostat. • Check that B terminal is connected to the system
transformer.
• Check for 24 Vac between B and R 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 system switch at the 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 does not
come on. Thermostat minimum off time is
activated. Wait up to five minutes for the system to respond.
System selection is not set to
Heat. Set system selection to Heat.
Heating setpoint is below room
temperature. Check heating setpoint. Set heating setpoint to desired
temperature.