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Fault Handling
5. Pressure sensor fault
Fault phenomenon: The alarm indicator on the control panel flashes, the control panel sends 2C 2D 2E 2F alarm.
Fault reason: The interface is loose, open-short of the sensor, the main control interface is disconnected or short-circuited.
Fault handling process:
6. ED fault
Fault phenomenon: The centralized controller displays ED.
Fault reason: The centralized controller is broken or disconnected; main board test port fault; check if the shielded wire is connected properly
and correctly.
7. EE fault
Fault phenomenon: The controller of outdoor unit displays EE.
Fault reason: The controller is broken or disconnected; main board test port fault.
8. Communication fault between modules
Fault description: Communication failure between modules, unable to start the unit.
Fault handling process:
In addition, if the input voltage of the transformer provided with PCB is too low, it will cause low voltage in PCB and the unit will go off-line.
Yes
Yes
Yes
OK
OK
Fault (pressure sensor fault)
Check if the connection between the pressure
sensor and the main board of outdoor unit
is loose.
Reconnect securely.
Check if the pressure sensor is faulty.
Replace the sensor.
Main board fault:
Interface is broken, wetted or disconnected.
Replace the main board.
Error
Error
Error
OK
OK
Communication fault between modules
Check if the communication line is installed
and connected properly and if the wiring order
is correct.
Replace the communication
line and install properly.
Check if the controller or the main
board communication port is broken.
Replace the main board or the
drive board.
Check if shielded wire is used for
communication line.
Replace with shielded wire.
