Mitsubishi Electric CMB-PW202V-J Service Handbook page 78

[ VIII Troubleshooting ]
1. Error Code
6600
Address overlaps
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) Two or more of the followings have the same address:
Outdoor units, WCB, indoor units, LOSSNAY units,
controllers such as ME 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.
(2) Electrical noise on the transmission wire distorted the
transmission signals.
HWE09070
Cause Check method and remedy
Find the unit that has the same address as that of the error
source.
If address overlaps are detected, correct the address.
Then, turn off the power to the outdoor units, indoor
units, WCB, and LOSSNAY units, keep them all turned
off for at least five minutes, and turn them back on.
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