Multi F Four-Way Ceiling Cassette Service Manual

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Only for training and service purposes
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Part 5. Trouble Shooting
6.7 Troubleshooting Outdoor Error
▶A2UW18GFA0/A3UW24GFA0
Display
code
Title Cause of error Check point & Normal condition
21
High current into the
compressor
• Compressor blocked
• Disconnection/shortcircuit
inside compressor
• Over load operation
(Outdoor fan constraint,
screened, blocked)
• Burned parts inside PCB
• Check compressor constraint
• Check compressor wire open/short
• Check compressor insulation damage
• Check outdoor fan constraint / screened / flow
structure
• Check if IPM burned