CS-HE9MKD, CU-HE9MKD, CS-HE12MKD, CU-HE12MKD - Panasonic Air Conditioner Service Manual (repair manual). Page 82

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• During cooling, compressor frequency = Fcmax.
• During heating, compressor frequency > Fhrated.
• During cooling and heating operation, running current: 0.65A < I < 1.65A.
• During cooling, indoor intake - indoor pipe < 4

“C

• During heating, indoor pipe - indoor intake < 5

“C

- Gas shortage detection 1: A gas shortage is detected by checking the CT-detected input current value and the compressor

running frequency. During startup and operating of cooling and heating, input current < 8.78/256 (A/Hz) x compressor
running frequency + 0.25.

- Gas shortage detection 2: A gas shortage is detected by checking the difference between indoor pipe temperature and

indoor intake air temperature during cooling and heating.

• Faulty indoor intake air or pipe temperature sensor
• 2/3 way valve closed
• Refrigerant shortage (refrigerant leakage)
• Clogged expansion valve or strainer
• Faulty outdoor unit
• Poor compression of compressor