Mitsubishi Electric City Multi CMB-WP108V-G, Service Manual

Page: 194 / 301

[
IX
Troubleshooting ]
- 185 - HWE1113B GB
7102
1. Error Code
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
7102
Error source Cause Check method and remedy
Outdoor unit (1) Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below. 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).
(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.
Œ
ME remote controller
Nothing appears on the remote controller be-
cause it is not powered.
Œ
MA remote controller
"HO" or "PLEASE WAIT" blinks.
(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.
(6) The units other than HBC controller and indoor
units for exclusive use with HBC controller are
connected.
Restri c tion on t h e number o f units Number o f units
1
1
1 - 1 5 : WP2 00 model
1 - 1 8 : WP2 50 model
Total number o f indoor units
Number o f HBC c ontrollers
Total number o f outdoor units