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Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[04] 1. Connection error of communication cable between
Inverter serial signal short circuit inverter and interface PC boards
2. Defective interface PC board
3. Defective inverter PC board
4. Noise from outside
5. High level refrigerant leak if RBC-RD2-PE fitted.
Is communication connector
between inverter and interface PC
boards connected?
Check connection
On inverter PC board:CN07
On interface PC board:CN600
Is there continuity of the
communication cable between
inverter and interface PC boards?
Is there voltage present between
pins 4 and 5 of CN600 on interface
PC boards? [Measurement by tester:
DC 0 to 5V, 5 pin GND]
Is there voltage present between
pins 3 and 5 of CN600 on interface
PC boards? [Measurement by tester:
DC 0 to 5V, 5 pin GND]
Check noise interference from
outside, etc.
Is refrigerant detector
RBC-RD2-PE fitted to unit?
Are the High Level Alarm and
the shutdown LEDs (Red) on ?
Refrigerant leak.
Leak check unit.
Replace communication cable.
Interface PC board is defective.
Inverter PC board is defective.
Complete checks detailed above.
Complete checks detailed above.
No
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
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