Error Code [7102] - Mitsubishi Electric HP120TNU-A Service Handbook

[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
7-9-3

Error Code [7102]

1. Error code definition
Wrong number of connected units
2. Error definition and error detection method
The number of connected indoor units is "0" or exceeds the allowable value.
3. Error source, cause, check method and remedy
Error source
Outdoor unit (1) Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below.
Number of units
Total number of
indoor units
Number of BC
controllers
Number of Main
BC controllers
Number of Sub BC
controllers
Total number of
LOSSNAY units
(During auto
address start-up
only)
Total number of
outdoor units
(2) Disconnected transmission line from the outdoor
unit or BC controller
(3) Short-circuited transmission line
When (2) and (3) apply, the following display will
appear.
(4) The model selection switch (SW5-7) on the out-
door unit is set to OFF. (Normally set to ON)
(5) Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
HWE18220_GB
Cause
Restriction on the number of units
18 : 72 model
24 : 96 model
30 : 120 model
36 : 144 model
48 : 192 model
50 : 240 model
1
(HP72 - HP120 models only)
0 or 1
0 - 11
0 or 1
1 : HP72 - HP120 models
2 : HP140 - HP240 models
ME remote controller
Nothing appears on the remote controller be-
cause it is not powered.
MA remote controller
"HO" or "PLEASE WAIT" blinks.
Check method and remedy
1) Check whether the number of units con-
nected to the outdoor terminal block
(TB3) for indoor/ outdoor transmission
lines does not exceed the limitation. (See
(1) and (2) on the left.)
2) Check (2) - (3) on the left.
3) Check whether the transmission line for
the terminal block for centralized control
(TB7) is not connected to the terminal
block for the indoor/outdoor transmission
line (TB3).
4) Check the setting for the model selection
switch on the outdoor unit (Dipswitches
SW5-7 on the outdoor unit control board).
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