Troubleshooting
Samsung Electronics 4-29
When the outdoor unit power is not ON - Initial Diagnosis : 3-phase products
(cont.)
Continue
Yes
After replacing the main PCB and resetting the
power, check everything is normal.
Connect the power wire (First turn off the power
of the Terminal Box!)
1. Connect the power wire.
2. Turn on the Terminal Box and check whether
normal power is supplied to the outdoor unit.
No
No
Check the power parts.
(Switch off power to the Terminal Box
before inspection!)
1. Is there a fault with a fuse? (Short-Normal, Open-Fault)
2. When the bridge diode is measured with "+ / -" (output voltage),
does the voltage exceed 290Vdc?
3. Is the power supply voltage 12V?
4. Is there a fault with a fuse of EMI PCB?
(Short-Normal, Open-Fault)
Fan Motor connector
after separating and resetting the power,
check everything is normal.
(Separate the connector after turning off the power of the
Terminal Box! When detaching and attaching the connector
during power supply, the motor can be damaged.)
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