Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 312

[ 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
Two or more of the following have the same address:
Heat source units, indoor units, LOSSNAY units, con-
trollers 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.
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 AE-200/AG-150A/
GB-50ADA/PAC-YG50ECA/BAC-HD150 are con-
nected is short-circuited.
(3) When two or more power supplies are connected to
the M-NET
HWE15060
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 heat source 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/GB-50ADA/PAC-YG50ECA/BAC-
HD150, and correct any problem found.
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