Mitsubishi Electric PUHY-HP200 Service Handbook page 174

[ IX Troubleshooting ]
1. Error Code
7102
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)
HWE08110
Cause
Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below.
Restriction on the number of units
Number of units
Total number of
1 - 17 : HP200
indoor units
1 - 21 : HP250
1 - 34 : HP400
1 - 43 : HP500
Total number of
LOSSNAY units
(During auto
address
start-up only)
Total number of
1 : HP200, HP250
outdoor units
2 : HP400, HP500
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.
1)
0 or 1
3)
4)
- 165 -
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).
GB