Mitsubishi Electric PURY-P72TYJMU-A Service Handbook page 255

[ IX 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 following have the same address:
Outdoor units, indoor units, LOSSNAY units, control-
lers 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.
1. Error Code
6601
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
(1) No voltage is applied to the M-NET transmission line
that AG-150A/G-50A is connected to.
(2) M-NET transmission line to which AG-150A/G-50A
is connected is short-circuited.
HWE0913A
Cause
Cause
- 246 -
Check method and remedy
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 LOSSNAY units,
keep them all turned off for at least five minutes, and
turn them back on.
Check method and remedy
Check if power is supplied to the M-NET transmission
line of the AG-150A/G-50A, and correct any problem
found.
GB