Outdoor Unit Sub Pcb Communication Error - Mitsubishi Heavy Industries SRK20ZSX-W Service Manual

Error code
Remote control: E45
1. Applicable model
All models
2. Error detection method
Detected communication error
of more than 15 seconds 4 times
in 15 minutes.
3. Condition of error displayed
When communication is not
established between the outdoor
unit sub PCB and the outdoor
main PCB.
4. Presumable cause
• Defective outdoor unit sub
PCB
• Defective connector between
the outdoor unit main PCB
and outdoor unit sub PCB
• Defective outdoor unit main
PCB
Note:
LED Green Red
Indoor Keeps flashing Stays OFF
– 4-time flash
Outdoor
5. Troubleshooting
Diagnosis
Is the connector
connection between the outdoor unit
main PCB and the outdoor sub
PCB OK?
YES
Is the power source voltage OK?
YES
Is the
communication wire
between the main PCB and the outdoor unit sub
PCB connected properly?
YES
Replace the outdoor unit main PCB.
Is normal state restored?
147
-
Content
Outdoor unit sub PCB
communication error
NO
NO
NO
NO
YES
-
'19 • SCM-SM-276
Countermeasure
Correct connector.
Check why power is not
supplied to outdoor unit
sub PCB.
Connect communication
wire securely.
Defective outdoor unit sub
PCB → Replace.
Malfunction by temporary
noise