Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 248

[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)
(2)
(3)
(4)
(5)
(6)
BS_07_E
Cause
Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below.
Number of units
Restriction on the number of units
26 : 200 model
Total number of
indoor units
32 : 250 models
39 : 300 models
45 : 350 models
50 : 400 models
50 : 450 models
50 : 500 models
Total number of
LOSSNAY units
(During auto
address
start-up only)
1 : (E)M200 - (E)M500YNW models
Total number of
outdoor units
Total number of
hydro units
Disconnected transmission line of the outdoor unit 2)
Short-circuited transmission line
When (2) and (3) apply, the following display will
appear.
ME remote controller
Nothing appears on the remote controller be-
cause it is not powered.
MA remote controller
"HO" or "PLEASE WAIT" blinks.
The model selection switch (SW5-7) on the out-
door unit is set to OFF. (Normally set to ON)
Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
Incorrect type of indoor units are connected.
1)
0 or 1
1
3)
4)
Check method and remedy
Check whether the number of units
connected to the outdoor terminal
block (TB3) for indoor/ outdoor
transmission lines does not exceed
the limitation. (See (1) and (2) on
the left.)
Check (2) - (3) on the left.
Check whether the transmission
line for the terminal block for cen-
tralized control (TB7) is not con-
nected to the terminal block for the
indoor/outdoor transmission line
(TB3).
Check the setting for the model se-
lection switch on the outdoor unit
(Dipswitches SW5-7 on the outdoor
unit control board).
chapter 7 -
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