Toshiba MMU-P0121H Service Manual page 98

Check code
[dE]
Indoor address undefined
While [dE] 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 have passed after power
supply was turned on, a fault is considered. Check the following items.
• Check failure of indoor main P.C. board (MCC-1361).
• Source check of communication noise
• Check faulty setting of jumper line on indoor main P.C. board (MCC-1361).
Check code
[dF]
Outdoor address undefined
While this check code is displayed, wait for a moment. When the address is defined, the operation is auto-
matically reset. However, if the check code does not disappear 20 minutes have passed after power supply
was turned on, a fault is considered. Check the following items.
• Fault check of outdoor unit interface P.C. board
• Source check of communication noise between outdoor units
Operation cause
1. Indoor unit in automatic addressing mode
2. Setting error of indoor main P.C. board (MCC-1361)
3. Indoor main P.C. board (MCC-1361) failure
4. Communication noise
Operation cause
1. Outdoor unit in automatic addressing mode
2. Defective indoor unit interface P.C. board
3. Communication noise
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