4-30 Samsung Electronics4-3-22 Pipe Blocking Error (Error Code: E422)1. Test Item1) Check the open state of the outdoor unit service valve.2) Check the connection of the pipe.3) Check the operation of the EEV.4) Check the refrigerant leakage.5) Check the connection of the indoor unit PBA EVA sensor.6) Check the fault in the indoor unit EVA sensor.2. Check procedureYesYesYesIf there occurs E422 error, reset the power andcheck in the following order.Check whether the pipe is empty and open allthe service valves on the gas and liquid pipes.Change and connect the pipes immediatelyand empty the pipes and then open the servicevalves.Check the replacement of the EEV (body/coil)and the refrigerant leaking part. After that,recharge.Check the temperature value throughS-NET, etc. and then if there is a fault, replaceand reconnect.NoNoNoNoCheck the opening of the outdoor unitservice valve.Check the connection ofthe pipes (such as disconnection, bent, orcross-connection with other sets).Check the EEV operation andthe refrigerant leakage.Check the fault in the indoor unit EVAsensor and the connection state.
