Power Transistor Anomaly - Mitsubishi Heavy Industries SRK20ZSX-W Service Manual

Error code
Error code
Remote control:
E51
Remote controller: E51
1. Applicable model
All models
2. Error detection method
Power transistor primary current
3. Condition of error displayed
If the power transistor primary
current exceeds the setting value
for 3 seconds, the compressor
stops.
4. Presumable cause
• Outdoor unit main PCB
anomaly
• Dust on outdoor unit main PCB
• Blown F2 fuse
Note:
LED Green Red
LED Green Red
Indoor Keeps flashing Stays OFF
Keeps flashing Stays Off
Indoor
– 1-time flash
Outdoor
5. Troubleshooting
Diagnosis
Check soldered
surfaces on the outdoor unit main PCB
for foreign matter like dust,
fouling,etc.
YES
Is F8 fuse
(250V, 20A)blown?
150
-
Content
Content
Power transistor error

Power transistor anomaly

(Models SRC50, 60)
NO
YES
NO
-
'19 • SCM-SM-276
Countermeasure
Remove foreign matter
like dust, fouling, etc.
Replace fuse.
Defective outdoor unit
main PCB Replace.