Panasonic CS-E18JKDW / CU-E18JKD / CS-E21JKDW / CU-E21JKD / CS-XE18JKDW / CU-XE18JKD Service Manual ▷ View online
85
16.5.18. H97 (Outdoor 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.
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 outdoor unit PCB.
• 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 outdoor unit PCB.
Troubleshooting
86
16.5.19. H98 (Indoor High Pressure Protection)
Error Code will not display (no Timer LED blinking) but store in EEPROM
Malfunction Decision Conditions
• During heating operation, the temperature detected by the indoor pipe temperature sensor is above 60
qC.
Malfunction Caused
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• Air short circuit.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
• Dust accumulation on the indoor unit heat exchanger.
• Air short circuit.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
Troubleshooting
87
16.5.20. H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)
Error code will not display (no TIMER LED blinking) but store in EEPROM
Malfunction Decision Conditions
• Freeze prevention control takes place (when indoor pipe temperature is lower than 2
qC).
Malfunction Caused
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• Air short circuit.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
• Dust accumulation on the indoor unit heat exchanger.
• Air short circuit.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
Troubleshooting
88
16.5.21. F11 (4-way valve Abnormality)
Malfunction Decision Conditions
• When heating operation, when indoor pipe temperature is below 10
qC.
• When cooling operation, when indoor pipe temperature is above 45
qC.
Malfunction Caused
• Connector in poor contact.
• Faulty sensor.
• Faulty outdoor unit PCB.
• 4-way valve defective.
• Faulty sensor.
• Faulty outdoor unit PCB.
• 4-way valve defective.
Troubleshooting
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