Panasonic CS-E18SD3UAW service manual - Page 77

15.5.6 H19 (Indoor Fan Motor - DC Motor Mechanism Locked) Malfunction Decision Conditions  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550 rpm or < 50 rpm) Malfunction Caused  Operation stops due to short circuit inside the fan motor winding.  Operation stops due to breaking of wire inside the fan motor.  Operation stops due to breaking of fan motor lead wires.  Operation stops due to Hall IC malfunction.  Operation error due to faulty indoor unit PCB. Troubleshooting When abnormality indication starts again Turn off power supply and rotate fan by hand Does fan rotate smoothly? YES Turn power supply on and operate fan. Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. NO Replace fan motor Does it rotate? NO Turn off power supply and disconnect fan motor connector, then turn power on. YES Stop fan motor Check the rotation feedback output from fan motor. Check the output of fan motor from indoor PCB Is the motor power supply voltage ~325Vdc (pin 1 & 4) generated? Rotate the fan motor by hand, is the rotation feedback NO voltage 15Vdc (pin 7 & 4) generated? YES NO Is the motor control voltage 15Vdc (pin 5 & 4) generated? NO Operate the fan, is the rotation command voltage 1~5Vdc (pin 6 NO & 4) generated? YES Replace indoor PCB Replace fan motor 77