4.5 Control System Self-Check
The Display/Control PCB has a self-check function. Press and hold the “LIGHT” and “DOWN”
keys at the same time for 5 seconds, the indicator light will flash once to confirm the input and the
unit will activate the self-check program. The following tests will be seen, otherwise replace the PCBs:
LED indicators will be ON one by one.
LED light will be ON.
Temperature reader LED will display from 00 to 99.
Fan motor, compressor and heater will be ON.
After the self-check program has finished the unit will automatically go back to normal
operation.
4.6 Test Mode
Press and hold the “LIGHT” and “UP” keys at the same time for 5 seconds with power ON, the
indicator light will flash twice to confirm the input and the unit will run in the TEST MODE. The
compressor and all fan motors will operate continuously & independent from the SET temperature.
At the same time the display shows “--". The TEST Mode will automatically exit after 30 minutes or
you can stop the TEST mode by disconnecting the unit from its power source.
5. Schematic Diagrams
5.1 CWB1760FD Wiring Diagram
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