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Inverter communication alarm
Is communication connector
between inverter and interface
P .C. boards connected?
Is there continuity
of the communication cable
between inverter and
interface P .C. boards?
Is there voltage present
between pins 4 and 5 of
CN600 on interface P .C. boards?
[Measurement by tester:
DC 0 to 5V, 5 pin GND]
Is there voltage present
between pins 3 and 5 of
CN600 on interface P .C. boards?
[Measurement by tester:
DC 0 to 5V, 5 pin GND]
Check noise interference from
14
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.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[04]
No
Yes
No
Yes
No
Yes
No
Yes
outside, etc.
No
Yes
No
Yes
Operation cause
1. Connection error of communication cable between
inverter and interface P .C. boards
2. Defective interface P .C. board
3. Defective inverter P .C. board
4. Noise from outside
5. High level refrigerant leak if RBC-RD2-PE fitted.
[
Interface P .C. board is defective.
Complete checks detailed above.
Complete checks detailed above.
58
Check connection
On inverter P .C. board:CN07
On interface P .C. board:CN600
Replace communication cable.
Inverter P .C. board is defective.
]
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