Troubleshooting74 Samsung ElectronicsError Mode E201, E202Symptom Communication error between the Hydro unit and outdoor unit for two minutesFailure Communication error between the Hydro unit unit and outdoor unit4-5-6 Communication error after finishing Tracking(Hydro unit)NoYesNoYesIs there a response from the Hydro unit PCB?(LED01 (RED) is not ON)In this case, is thevoltage waveform between the lines squarewave with amplitude over ±0.7V as shownin the following picture?Check the communication cable andreplace the Hydro unit unit PCBRemove the communication cable connectingthe outdoor unit to Hydro unit unit, andmeasure the signal on LINE 2 of the outdoorunit with a scopeReconnect the cable connectingthe outdoor unit to the Hydro unit unitand restart the unit.If the communication still doesn’t work,replace the Hydro unit unit PCB.Check the communicationcable in the outdoor unit PCBand replace the PCBLED01F1, F2
