62-0125—3
10
T7300F SERIES 2000 COMMERCIAL MICROELECTRONIC CONVENTIONAL
OR HEAT PUMP THERMOSTAT
(Continued)
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
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)
set heating higher or
cooling lower.)
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.
TROUBLESHOOTING GUIDE
