Troubleshooting Guide - Trane TAYSTAT 375 Quick Start Manual

TROUBLESHOOTING GUIDE

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