Mitsubishi Electric CITY MULTI PURY-200M-B-BM. BSG Service Handbook page 26

[ V Troubleshooting ]
2. Transmission error
Error Error definition and error
Code detection method
6600 Address overlaps
The error is detected when the
same address is transmitted
from different units.
Note: The address/attribute
appeared on the dis-
play on the remote
controller indicates
the controller where
an error occurred.
Cause
(1) Two or more remote controllers
for the Outdoor units, indoor
units, BC controller, Fresh Mas-
ter, LOSSNAY, and the remote
controllers have the same ad-
dresses.
(2) When the transmission data is
changed due to the noise on the
transmission line.
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Check method and remedy
When 6600 error occurs, deactivate the er-
ror (stop key operation) by the remote con-
troller and restart the unit.
When an error occurrs again in 5 minutes:
→ Search the unit has the same address
with the error source
When the same address is found, turn
off the power of the Outdoor unit, BC
controller, Fresh Master, LOSSNAY
and the indoor unit for 5 minutes or
more after changing the address, and
then turn them on it again.
When an error does not occur after operat-
ing for 5 minutes or more:
→ Check the transmission wave shape/
noise.