Mitsubishi Electric CITY MULTI CMB-WP1016V-GA1, Service Handbook

Page: 138 / 294

[
VIII
Troubleshooting ]
- 129 -
HWE1410A GB
5701
1. Error Code
Loose float switch connector
2. Error definition and error detection method
Detection of the disconnected float switch (open-phase condition) during operation
3. Cause, check method and remedy
(1) CN4F disconnection or contact failure
Check for disconnection of the connector (CN4F) on the indoor unit control board.
6600
1. Error Code
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
6601
1. Error Code
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
5701
6600
Cause Check method and remedy
(1) Two or more of the following have the same address:
Outdoor units, HBC controllers, indoor units, LOSS-
NAY units, controllers 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.
 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."
(2) Signals are distorted by the noise on the transmission
line.
6601
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.
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.
(2) M-NET transmission line to which AG-150A/GB-
50ADA/PAC-YG50ECA/BAC-HD150 are connected
is short-circuited.
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