Panasonic CU-4E24RBU Service Manual

Also see for CU-3E19RBU: Operating instructions Service manual Service manual Service manual Installation manual

6115.2.6 H28 (Outdoor Heat Exchanger Temperature Sensor 1 Abnormality)Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperaturesensor are used to determine sensor errors.Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.Abnormality Judgment: Continue for 5 seconds.TroubleshootingCheck the outdoor pipe temperature sensor:- Plug out connector from the outdoor unit PCB- Measure the resistance of the outdoor pipetemperature sensor- Defect in outdoor pipetemperature sensor- Replace the outdoor pipetemperature sensorYesFor safety reason and to prevent componentbreakdown, always switch off the power beforeremove and connect the component.Is the measured resistance of theoutdoor pipe temperature sensormatches the value specified in itscharacteristic chart?NoCheck the connector connection:- Turn off the power- Check the connector connection- Connector poor contact- Correct the connectionNoIs the connectorconnection normal?- Defect in outdoor unit PCB- Replace the outdoor unit PCBYesSensor (Thermistor)CharacteristicsOutdoor Air SensorOutdoor Heat ExchangerSensor1212706050403020-10(14)0(32)10(50)20(68)30(86)40(104)50(122)100R esistan ce (kΩ )Temperature °C (°F)