Panasonic CU-5E36QBU-5 Service Manual

Also see for CU-5E36QBU-5: Operating instructions

6615.2.14 F11 (4-Way Valve Switching Abnormality)Malfunction Decision Conditions During heating operation, when (liquid pipe temperature – outdoor pipe temperature) is below -5°C. During cooling operation, when (outdoor pipe temperature – liquid pipe temperature) is below -5°C.Malfunction Caused Connector in poor contact. Faulty sensor. Faulty outdoor unit PCB. Four way valve defective.Abnormality Judgment: 4 times happen within 30 minutes.TroubleshootingIs F11 occur duringheating operation?Is the four way valve coilenergize during coolingoperation?NoCheck the liquid pipe and outdoorpipe temperature sensors.Replace the liquid pipe andoutdoor pipe temperature sensor.NoDoes it conform to thesensor characteristic chart?YesFour way valve coildisconnected (loose)?Reconnect the harness.YesHarness out of connector?NoReplace the outdoor unitPCB.YesFor safety reason and to prevent componentbreakdown, always switch off the power beforeremove and connect the component.Correct the four wayvalve coil.YesCheck the continuity ofthe four way valve coil.Replace the four wayvalve coil.NoDisconnect the harness from theconnector. Valve coil windingresistance no open circuit?NoMeasure AC voltage suppliedduring heating operation.Is the voltage supply to fourway valve 220-230Vac?Replace the outdoor unitPCB.Replace the four wayvalve.Replace the four wayvalve.NoYesYesNo1CN-HOT(VH3-2)4 WAYSVALVE2 3Caution