Toshiba MMU-AP0071MH - Manual (Page 30)

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New check code
1. Difference between the new check code and the current system
The displaying method of the check code will change from this model onwards.
Display on wired remote controller
• [ ] goes on.
• [UNIT No.] + Check code + Operation lamp (Green) flash
Display on sensor part of wireless remote controller
• Block display will show a combination of [ ] [ ] [ ] symbols.
Display on 7-segment in outdoor unit
• Unit No. and check code are displayed.
• In case of error the auxiliary code, check code and sub-code
are displayed alternately.
2. Special mention
• When the air conditioner stops and the error is cleared, the check code display on the remote controller will also
disappear.
However, if the error continues after the unit has been stopped, the check code will immediately be displayed
when the unit is restarted.
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9
TROUBLESHOOTING
Used characters
Characteristics of code classification
Block display
Check code in current system
Hexadecimal notation, 2 digits
Few classification of communication/incorrect setup system
Indoor P.C. board, Outdoor P.C. board, Cycle, Communication
New check code
Alphabet + Decimal notation, 2 digits
Many classification of communication/incorrect setup system
Communication/Incorrect setup (4 ways), Indoor protection,
Outdoor protection, Sensor, Compressor protection, etc.
Display
A
C
E
F
H
J
L
P
Classification
Unused
Central control system error
Communication system error
Each sensor error (Failure)
Compressor protective system error
Unused
Setup error, Other errors
Protective device operation