Diagnostic Procedure For Check Code; [04] Inverter Serial Signal Short Circuit - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code

Check code
[04]
Inverter serial signal short circuit
Is communication connector
between inverter and interface PC
boards connected?
Yes
Is there continuity of the
communication cable between
inverter and interface PC boards?
Yes
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]
Yes
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]
Yes
Check noise interference from
outside, etc.
Is refrigerant detector
RBC-RD2-PE fitted to unit?
Yes
Are the High Level Alarm and
the shutdown LEDs (Red) on ?
Yes
Refrigerant leak.
Leak check unit.
Troubleshooting
Operation cause
1. Connection error of communication cable between
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.
No
No
No
No
No
No
79
Check connection
[
On inverter PC board:CN07
On interface PC board:CN600
Replace communication cable.
Interface PC board is defective.
Inverter PC board is defective.
Complete checks detailed above.
Complete checks detailed above.
]
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