116
Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[dE] 1. Indoor unit in automatic addressing mode
Indoor address undefined 2. Indoor unit PC board set-up error
3. Defective indoor unit PC board
4. Communication noise interference
While this check code is displayed, wait for a moment. When the address is defined, the operation is
automatically reset. However, if the check code does not disappear 20 minutes after the power source was
turned on, a fault is considered. Check the following items.
• Fault check of indoor unit PC board
• Source check of communication noise interference
• Incorrect set-up of jumper options on indoor unit PC board
Check code Operation cause
[dF] 1. Outdoor unit in automatic addressing mode
Outdoor address undefined 2. Defective indoor unit interface PC board
3. Communication noise interference
While this check code is displayed, wait for a moment. When the address is defined, the operation is
automatically reset. However, if the check code does not disappear 20 minutes after the power source was
turned on, a fault is considered. Check the following items.
• Fault check of outdoor unit interface PC board
• Source check of communication noise interference between outdoor units.
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