Panasonic CS-E9SD3UAW Service Manual

Contents

8115.5.10 H28 (Outdoor Pipe Temperature Sensor 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.TroubleshootingWhen abnormality indication starts againCheck the outdoor heat exchanger temperature sensor:● Plug out connector from the outdoor unit PCB● Measure the resistance of the outdoor heat exchangertemperature sensorFor safety reason and to preventcomponent breakdown, always switchoff the power before remove andconnect the component.Is the measured resistance of the outdoor heat exchangertemperature sensor matches the value specified in itscharacteristic chart?●●● Defect in outdoor unit PCB● Replace the outdoor unit PCBCheck the connector connection:● Turn off the power● Check the connector connectionIs the connector connection normal?YES● Connector poor contact● Correct the connectionNONOYESDefect in outdoor heat exchangertemperature sensorReplace the outdoor heat exchangertemperature sensorSensor (Thermistor)Characteristics706050Resistance (kΩ)Temperature (ºF)4030201001 Outdoor Air Sensor2 Outdoor Heat ExchangerSensor21Caution14 32 50 68 86 104 122