Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
IX
Troubleshooting ]
Error
Code
Error definition and error detec-
tion method
Cause Check method and remedy
6603 Transmission circuit bus-busy
1.Error occurred when the
transmission is disabled for
4-10 minutes in a row due to
collision of the transmitted
data.
2.Generated error when the
command cannot be trans-
mitted to the transmission
line for 4-10 minutes in a
row due to noise
Note: The address/attribute
appeared on the display
on the main remote con-
troller indicates the con-
troller where an error
occurs.
(1) The transmission processor
cannot be transmitted as the
short-wavelength voltage like
noise exists consecutively on
the transmission line.
(2) Error source controller failure
No noise indicates that the error source
controller is a failure.
If noise exists, investigate the noise.
-> No noise indicates that the error
source controller is a failure.
-> If noise exists, investigate the noise.
6606 Communication error with the
transmission processor
Communication error between
the main microcomputer on the
indoor unit board and the mi-
crocomputer for transmission
Note: The address/attribute
appeared on the display
on the main remote con-
troller indicates the con-
troller where an error
occurs.
(1) Data is not properly transmitted
due to accidental erroneous op-
eration of the controller of the er-
ror source.
(2) Error source controller failure
Turn off the power source of the outdoor
and the indoor units.(When the power
source is turned off separately, the micro-
computer will not be reset, and the error
will not be corrected.)
-> If the same error occurs, the error
source controller is a failure.