Under/over voltage error - Samsung air conditioner

Discussion in 'General Electronics Chat' started by 2024301, Jun 20, 2015.

  1. 2024301

    Thread Starter New Member

    Jun 20, 2015
    My two year old Samsung system will not heat or cool. The indoor unit turns on but the outdoor unit will not.

    I have removed the cover from the condenser unit and inspected the main board. The diagnostic light sequence indicates a dc-link voltage under/over or PFC Overload / H / W DC link over error.

    I have inspected connectors and verified AC voltage is correct. There doesn't appear to be any corrosion or water ingress on the board. I haven't yet removed the board to inspect the underside. Wiring between the units appears sound. When the indoor unit is switched on I can here relays switching on the pcb board.

    Troubleshooting guides online suggest that the error can occur if:
    Voltage across C101, 102 & 103 on the Outdoor PCB is out of range and
    Causes are – Mains voltage spikes or brown outs, Compressor slugging liquid, bad Outdoor PCB

    This is an image of the PCB board:http://i.imgur.com/jxaU4eN.jpg

    This is a shot of the wiring diagram for the unit and error code list:http://i.imgur.com/5O21JMo.jpg

    The model of the condenser unit is: AQV09TWSX

    Any assistance would be much appreciated!