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16.4.24. F91 (Refrigeration Cycle Abnormality)
Malfunction Decision Conditions
• 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 < 4eC
• During heating, indoor pipe - indoor intake < 5eC
Multi Models Only
- 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 compresso
r
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.
Malfunction Caused
• 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
Troubleshooting
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