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

2. Transmission error

Error
Error definition and error detec-
Code tion method
6600 Address overlaps
The error is detected when the
same address is transmitted
from different units.
Note: The address/attribute
appeared on the display
on the main remote con-
troller indicates the con-
troller where an error
occurs.
6601 Unset polarity
The error detected when trans-
mission processor cannot dis-
tinguish the polarities of the
M-NET transmission line.
Cause
(1) Two or more outdoor units, in-
door units, or the main remote
controllers have the equivalent
addresses.
(2) The transmission signal is
changed due to noise interfer-
ence.
(1) No voltage is applied to the
M-NET transmission line that
G-50A is connected to.
(2) M-NET transmission line to
which G-50A is connected is
short-circuited.
- 129 -
[ IX Troubleshooting ]
Check method and remedy
If the error "6600" occurs, reset the error
(or stop the unit) using the MA remote con-
troller, external input, or the main control-
ler, and start the unit again.
(1) If the same error occurs within 5 min-
utes, find the unit that has the same
address as that of the error source
unit.
When the same address is found, change
the addresses, turn off the powers of the
outdoor and the indoor units, leave them
OFF for 5 minutes or more, and then turn
them ON again.
(2) If the same error does not occur for 5
minutes or more, check transmission
wave shape/noise on transmission
line by following <Investigation meth-
od of transmission wave shape/
noise>.
Check if power is supplied to the M-NET
transmission line of the G-50A, and cor-
rect any problem found.