Panasonic CS-E21JB4EA / CU-E21HBEA Service Manual ▷ View online
61
15.5.14. 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
°C.
Malfunction Caused
• Air short circuit.
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• 2/3 way valve closed.
• Detection error due to faulty indoor fan motor.
• Excessive refrigerant.
• Clogged expansion valve or strainer.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• 2/3 way valve closed.
• Detection error due to faulty indoor fan motor.
• Excessive refrigerant.
• Clogged expansion valve or strainer.
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
Troubleshooting
62
15.5.15. 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
°C).
Malfunction Caused
• Air short circuit.
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• 2/3 way valve closed.
• Faulty indoor fan motor.
• Refrigerant shortage (refrigerant leakage).
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
• Clogged air filter of the indoor unit.
• Dust accumulation on the indoor unit heat exchanger.
• 2/3 way valve closed.
• Faulty indoor fan motor.
• Refrigerant shortage (refrigerant leakage).
• Detection error due to faulty indoor pipe temperature sensor.
• Detection error due to faulty indoor unit PCB.
Troubleshooting
63
15.5.16. F11 (4-way valve Abnormality)
Malfunction Decision Conditions
• When heating operation, when indoor pipe temperature is below 10
°C.
• When cooling operation, when indoor pipe temperature is above 45
°C.
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
64
15.5.17. F90 (Power Factor Correction Protection)
Malfunction Decision Conditions
• During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit
main PCB senses abnormal high DC voltage level.
Malfunction Caused
• DC voltage peak due to power supply surge.
• DC voltage peak due to compressor windings not uniform.
• Faulty outdoor PCB.
• DC voltage peak due to compressor windings not uniform.
• Faulty outdoor PCB.
Troubleshooting
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