T7300F SERIES 2000 COMMERCIAL MICROELECTRONIC CONVENTIONAL OR HEAT PUMP THERMOSTAT
62-0125—3
10
TROUBLESHOOTING GUIDE
Symptom
Possible Cause
Action
Display does not turn
on.
Thermostat is not powered.
•
Check that the X terminal is connected to the system
transformer.
•
Check for 24 Vac between X and R or RH terminals.
—If missing 24 Vac:
—check if the circuit breaker is tripped; if so, reset the
circuit breaker.
—check if the system fuse is blown; if so, replace the
fuse.
—check if the power switch on the HVAC equipment is
in the Off position; if so, set to the On position.
—check wiring between thermostat and HVAC
equipment and replace any broken wires and tighten
any loose connections.
—If 24 Vac is present, proceed with troubleshooting.
Temperature display is
incorrect.
Room temperature display has
been reconfigured.
Enter Installer Setup number 37 and reconfigure the display.
Thermostat is configured for
°F or °C display.
Enter Installer Setup number 14 and reconfigure the display.
Bad thermostat location.
Relocate the thermostat.
Display shows two dashes and
a degree sign.
Installer Setup 22 is set for remote sensing and the sensor is
missing or the circuit is open or shorted.
Temperature settings
will not change.
(Example: Cannot set
heating higher or
cooling lower.)
Upper or lower temperature
limits were reached.
Check the temperature setpoints:
•
Heating limits are 40 to 90°F (7 to 31°C)
•
Cooling limits are 45 to 99°F (9 to 37°C)
The setpoint temperature
range stops were configured.
Check Installer Setup number 34 and 35 and reconfigure the
setpoint stops.
Keypad is locked. When a
locked key is pressed,
LOC
flashes on the LCD.
•
Reset dip switch 1 on the back of the thermostat to enable
the keypad.
•
Enter Installer Setup number 25 or 40 and reconfigure
keypad lockout level.
Unable to configure
Installer Setup
Installer Setup is locked out.
Reset the dip switch 1 on the back of the thermostat to enable
the keypad.
Temperature settings
change from original
setting.
Heating and cooling setpoints
set too close together. There is
a deadband in automatic
changeover thermostat
models. Example: cool
setpoint = 72, deadband = 3,
heat setpoint = 68, changing
heat setpoint to 70
automatically changes the
cool setpoint to 73.
•
Check that the heating setpoint is lower than the cooling
setpoint.
•
Check Installer Setup number 30 to identify the deadband
between heating and cooling setpoints. Reconfigure if
desired.
Room temperature is
out of control.
Remote temperature sensing
is not working.
Checkout all remote sensors.
