Mitsubishi Electric PUHY-P200 Service Handbook page 243

[ IX Troubleshooting ]
6600
1. Error Code
6600
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) 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) Signals are distorted by the noise on the transmission
line.
6601
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/GB-50ADA/PAC-YG50ECA/BAC-
HD150 are connected to.
(2) M-NET transmission line to which AG-150A/GB-
50ADA/PAC-YG50ECA/BAC-HD150 are connected
is short-circuited.
HWE10040
Cause
Cause
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.
When air conditioning units are operating normally despite
the address overlap error
Check the transmission wave shape and noise on the
transmission line.
See the section "Investigation of Transmission Wave
Shape/Noise."
Check method and remedy
Check if power is supplied to the M-NET transmission
line of the AG-150A/GB-50ADA/PAC-YG50ECA/BAC-
HD150, and correct any problem found.
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