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14.4.19 F91 (Refrigeration Cycle Abnormality)
Malfunction Decision Conditions
• During cooling, compressor frequency = Fcmax.
• During cooling and heating operation, running current: 0.65A < I < 1.65A.
• During cooling, indoor intake - indoor pipe < 4°C
Malfunction Caused
• Refrigerant shortage (refrigerant leakage)
• Poor compression performance of compressor.
• 2/3 way valve closed.
• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.
Troubleshooting
2/3-way valve opened?
Oil oozing out from the 2/3 way valve?
Replace the capillary tube or dryer.
When F91 indication ha
ens
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Check the indoor air intake and pipe
temperature sensors.
Open 2/3 way valve
Check for gas leaking.
Repair the pipe flare or union nuts.
Reclaim and recharge refrigerant.
NO
NO
YES
YES
Does it conform to the sensor
characteristic chart?
Replace the indoor intake air or pipe
temperature sensor
NO
Capillary tube or dryer clogged?
Charge for a specified amount of fresh
refrigerant.
YES
Refrigerant cycle abnormality error again?
Replace outdoor unit PCB &
compressor
NO
YES
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