Samsung AQV12NSA Service Manual page 72

12-2-16 DC Link Over voltage/ Low voltage error
1. Checklist :
1) Is the power voltage normal?
2) Is the voltage of front and back terminal of indoor(outdoor) power relay normal?
3) Is the resistance value for DC Link voltage detection NORMAL?
4) Is the resistance value of DC Link discharge normal?
5) Is the appearance of DC Link Capacitor normal?
2. Troubleshooting procedure
Restart after power off.
Is the DC Link voltage error occurred again?
Is the power voltage normal?
Is the front and back terminal voltage of
indoor/outdoor power relay normal?
Reassembly the PCB.
Is the appearance of
DC Link Capacitor normal?
Is the resistance for the
detection of DC Link voltage normal?
Is the resistance value of
DC Link discharge normal?
Is the reactor insulation damaged?
Exchange the reactor.
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No
Yes
No
Yes
No
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Troubleshooting
Terminate the service.
Terminate the service.
Exchange the PCB.
Exchange the PCB.
Exchange the PCB.
Exchange the PCB.
Exchange the PCB.
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