Error Code [7102] - Mitsubishi Electric R410A Service Handbook

[7-8 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
7-8-3

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.
(2) Disconnected transmission line of the outdoor unit 2)
(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.
HWE14080
Cause
Number of units Restriction on the number of units
15 : P72 model
Total number of
indoor units
20 : P96 model
26 : P120 model
31 : P144 model
36 : P168 model
41 : P192 model
46 : P216 model
50 : P240 - 360 models
Total number of
LOSSNAY units
(During auto
0 or 1
address
start-up only)
1 : 72 - 144 models
Total number of
outdoor units
2 : 168 - 288 models
3 : P312 - 360 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)
3)
4)
- 228 -
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).
GB