Johnson Controls TEC-3620 - Symptom-Based Troubleshooting Guide

FlexSys Thermostat Zone Controller / LCD Touch Screen
TEC - 3620
Model:
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34
Installation / Operation Manual
V160919
TEC3000 Series On/Off or Floating Fan Coil and Zoning Thermostat Controllers with Dehumidification
Capability Installation Instructions
Controller Fault The controller has detected an internal
fault that it cannot recover.
Contact Johnson Controls product sales and
support.
An unknown error has prevented the
controller from turning on.
Contact Johnson Controls product sales and
support.
Touchscreen Unavailable The touchscreen components have
failed to initialize.
1. Reboot the controller.
2. If problems persist, contact Johnson Controls
product sales and support.
Board Mismatch The baseboard and CPU board are
paired incorrectly. An error message
appears on the TEC indicating the
model number of the baseboard and
CPU board.
Match the baseboard to its corresponding CPU
board. See Repair Information
for information on
ensuring that you have the CPU board and base
board paired correctly.
USB Malfunction A USB drive has malfunctioned and
drawn more than the maximum allowed
current.
1. Attempt to insert and use the USB drive
again.
2. Try a new USB drive.
3. If problems persist, contact Johnson Controls
product sales and support.
Table 9: Troubleshooting Details
1
(Part 1 of 3)
Symptom Probable Causes Solutions
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 2-pipe fan coil/VAV system does
not have a changeover sensor and
switch connected, or the sensor/switch
has failed.
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/switch).
The changeover temperature is
sensing a hot supply but the controller
is requesting cooling.
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/switch.
3. Check the placement of the supply
temperature sensor/switch.
4. Verify that the changeover is set up
correctly for the type of sensor
attached (sensor/switch).
Changeover temperature is sensing a
cold supply but the controller is
requesting heating.
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/switch.
3. Check the placement of supply
temperature sensor/switch.
4. Verify that the changeover is set up
correctly for the type of sensor
attached (sensor/switch).
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 Control Mode is set to Cooling
Mode but the controller is requesting
heating.
Change the Control Mode to Auto or
Heating.
The Control Mode is set to Heating
Mode but the controller is requesting
cooling.
Change the Control Mode to Auto or
Cooling.
Table 8: Fault List (Part 2 of 2)
Faults Probable Causes Solutions