Mitsubishi Electric City Multi PFAV-P500VMH-E, Service Handbook

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Troubleshooting ]
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HWE07150 GB
1. Error Code
Address overlap
2. Error definition and error detection method
An error in which signals from more than one indoor units with the same address are received
The address and attribute that appear on the remote controller indicate the controller that detected the error.
3. Cause, check method and remedy
1. Error Code
Polarity setting error
2. Error definition and error detection method
The error detected when transmission processor cannot distinguish the polarities of the M-NET transmission line.
3. Cause, check method and remedy
6600
Cause Check method and remedy
Two or more of the following have the same address:
Outdoor units, indoor units, LOSSNAY units, control-
lers such as M-NET remote controllers.
<Example>
6600 "01" appears on the remote controller
Unit #01 detected the error.
Two or more units in the system have 01 as their ad-
dress.
Find the unit that has the same address as that of the
error source.
Once the unit is found, correct the address. Then,
turn off the outdoor units, indoor units, and LOSS-
NAY units, keep them all turned off for at least five
minutes, and turn them back on.
6601
Cause Check method and remedy
(1) No voltage is applied to the M-NET transmission line
that G(B)-50A is connected to.
Check if power is supplied to the M-NET transmission
line of the G(B)-50A, and correct any problem found.
(2) M-NET transmission line to which G(B)-50A is con-
nected is short-circuited.