Johnson Controls TEC3000 Series Quick Start Manual page 21

Table 9: Troubleshooting details
Symptom
The controller displays Idle
with a Unit Status of Cooling
Unavailable due to
Changeover despite being above
cooling setpoint, or with a status
of Heating Unavailable due
to Changeover despite being
below the setpoint.
The controller displays Idle
with a Unit Status of Cooling
Unavailable due to Control
Mode despite being above cooling
setpoint, or with a status of
Heating Unavailable due to
Control Mode despite being
below the setpoint.
The controller provides an error
when trying to upgrade firmware.
The TEC3000 zone temperature
does not change fast enough
compared to the measured zone
temperature from a verification
device, such as a calibrated
sensor.
The zone space temperature
increases or decreases too
much when the unit is active in
unoccupied mode.
The controller provides an error
when trying to back up settings.
The controller provides an error
when trying to restore settings
from a backup.
Probable causes
The two-pipe fan coil/VAV
system does not have a
changeover sensor and switch
connected, or the sensor/switch
has failed.
The changeover temperature
is sensing a hot supply, but the
controller requests cooling.
Changeover temperature is
sensing a cold supply, but the
controller requests heating.
The Control Mode is set to
Cooling Mode, but the controller
requests heating.
The Control Mode is set to
Heating Mode, but the controller
requests cooling.
The firmware on the USB drive
is below the minimum required
version. Error code 1025.
The TEC3000 is configured by
default for larger spaces with
normal-sized equipment when a
proportional device is active.
The heating and cooling
equipment are too big for the
unoccupied space.
The USB drive is defective.
The USB drive is defective.
The Restore file is corrupt.
The Restore file is from an
incompatible model TEC.
TEC3000 Series Proportional Fan Coil Thermostats Quick Start Guide
Solutions
1. Check the wiring of the supply temperature
sensor/switch.
2. Verify that the changeover is set up
correctly for the type of sensor attached
(sensor or switch).
1. Verify that the supply is not in heating
mode. If it is, nothing can be done from the
TEC.
2. Check the wiring of the supply temperature
sensor or switch.
3. Check the placement of the supply
temperature sensor or switch.
4. Verify that the changeover is set up
correctly for the type of sensor attached
(sensor or switch).
1. Verify that the supply is not in cooling
mode. If it is, nothing can be done from the
TEC.
2. Check the wiring of the supply temperature
sensor or switch.
3. Check the placement of supply temperature
sensor or switch.
4. Verify that the changeover is set up
correctly for the type of sensor attached
(sensor or switch).
Change the Control Mode to Auto or Heating.
Change the Control Mode to Auto or Cooling.
Please use firmware version 3.0.2.xxxx (for
networked models) or 2.0.2.xxxx (for wireless
models) or higher. A reboot is required to clear
the Firmware Mismatch fault that occurs.
Select Control Setup >Tuning > Equipment Size
> Oversized.
Decrease the Unoccupied Off Delay parameter
from 10 minutes to a more appropriate time for
the equipment configuration.
Try a different USB drive.
Try a different USB drive.
Try restoring a different backup file.
Ensure that the backup file being restored was
from the same model TEC.
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