Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 237

[7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ]
7-8-6 Error Code [6603]
1. Error code definition
Transmission line bus busy error
2. Error definition and error detection method
Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy
Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise
Detail code 001: Transmission Bus-Busy error in centralized control system
Detail code 002: Transmission Bus-Busy error in indoor unit system
The address/attribute appeared on the display on the remote controller indicates the controller where an error oc-
curred.
3. Cause, check method and remedy
(1) The transmission processor cannot be transmit-
ted as the short-wavelength voltage like noise ex-
ists consecutively on the transmission line.
(2) Error source controller failure
7-8-7 Error Code [6606]
1. Error code definition
Communication error between device processor and transmission processor or M-NET processor
2. Error definition and error detection method
Communication error between device processor on circuit board and transmission processor or M-NET processor
Detail code 003: Communication error between device processor on circuit board and M-NET processor
The address/attribute appeared on the display on the remote controller indicates the controller where an error oc-
curred.
3. Cause, check method and remedy
(1) Data is not properly transmitted due to accidental
erroneous operation of the controller of the error
source.
(2) Error source controller failure
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Cause
Cause
Check method and remedy
Check the transmission wave shape and noise on the
transmission line.
Refer to the following page(s). [8-4 Checking Transmis-
sion Waveform and for Electrical Noise Interference]
→ No noise indicates that the error source controller is a
failure.
→ If noise exists, investigate the noise.
Check method and remedy
Turn off the power source of the outdoor and the indoor
units.(When the power source is turned off separately, the
microcomputer will not be reset, and the error will not be
corrected.)
→ If the same error occurs, the error source controller is
a failure.
BS_07_M