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E5 – INTERNAL & EXTERNAL COMMUNICATION ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: The frequency converter needs internal and external
communication. When the communication cannot be reached,
the internal and external units will indicate "internal and
external communication error". Only "main internal control
panel, connecting cable and outdoor unit control panel" are
related to communication; but sometimes the communication
error will be indicated when the external unit has no power
and the internal unit cannot connect with the external unit
due to other errors, then such situation should be
distinguished from "pure communication error" and treated in
a different way.
Inspection paths:
1.
Unit powers on and works: Are the internal unit and
external unit matched? → Is the phase sequence of
connecting wires of internal and external units correct?
2.
Unit does not power on: Can AC 220V be delivered to the
terminal block of the external unit? → Can the bridge
rectifier and module panel generate DC 310V? → Can the
outdoor unit control panel generate a low voltage power
supply of DC 5V? → Does the main external control panel
show the status of periodical reset?
Multimeter, main internal control panel in normal condition
Connecting wire phase sequence and contact, main internal
control panel, outdoor unit control panel, module panel
1.
Check if the IDU and the ODU are connected properly.
2.
Check the outdoor unit control panel, turn on the unit,
three lights should be lit up, they will then turn off and
the relay will pull in. If this does not occur, there is a power
supply problem.
3.
Connect the black signal line S to terminal N of ODU.
Turn on the A/C, if "E5" is still reported, the outdoor unit
control panel needs to be replaced.
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