Panasonic CS-E18SD3UAW service manual - Page 91

15.5.20 F95 (Outdoor High Pressure Protection: Cooling or Soft Dry) Malfunction Decision Conditions  During operation of cooling or soft dry, when outdoor unit heat exchanger high temperature data is detected by the outdoor unit heat exchanger thermistor. Malfunction Caused  Outdoor heat exchanger temperature rise due to short-circuit of hot discharge air flow.  Outdoor heat exchanger temperature rise due to defective of outdoor fan motor.  Outdoor heat exchange temperature rise due to defective outdoor heat exchanger thermistor.  Outdoor heat exchanger temperature rise due to defective of outdoor unit PCB. Troubleshooting When abnormality indication starts again Check the outdoor unit installation condition (during cooling or soft dry operation) Is there any improper heat radiation? NO Reset the error code and turn on the unit again YES Reinstall the outdoor unit Remove the obstacle(s) Clean the outdoor heat exchanger Is the outdoor fan motor operating? NO Measure the AC/DC voltage between pins of connector CN-FM outdoor unit PCB YES Check the outdoor heat exchanger thermistor: Turn off the power and disconnect the connector of outdoor heat exchanger thermistor from the PCB Measure the resistance of the outdoor heat exchanger thermistor Is the voltage supplied to the outdoor fan motor normal? NO (0V) YES (240VAC / 265~325VDC) Defect in outdoor unit PCB Replace the outdoor unit PCB Defect in outdoor fan motor Replace the outdoor fan motor For safety reason and to prevent component breakdown, always switch off the power before Caution remove and connect the component. Is the measured resistance of the outdoor NO heat exchanger thermistor matches the value specified in its characteristic chart? YES Defect in outdoor heat exchanger thermistor Replace the outdoor heat exchanger themistor Defect in outdoor unit PCB Replace the outdoor unit PCB 91