Mitsubishi Electric PUHY-P1000, Service Handbook, Page: 237 / 334

[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
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HWE14040 GB
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 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
connected to the outdoor terminal
block (TB3) for indoor/ outdoor
transmission lines does not exceed
the limitation. (See (1) and (2) on
the left.)
(2) Disconnected transmission line of the outdoor unit 2) Check (2) - (3) on the left.
(3) Short-circuited transmission line
When (2) and (3) apply, the following display will
appear. 3) 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).

ME remote controller
Nothing appears on the remote controller be-
cause it is not powered.

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) 4) Check the setting for the model se-
lection switch on the outdoor unit
(Dipswitches SW5-7 on the outdoor
unit control board).
(5) Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
Restriction on the number of units Number of units
0 or 1
17 : 200 model
21 : 250 models
26 : 300 models
30 : 350 models
34 : 400 models
39 : 450 models
43 : 500 models
47 : 550 models
50 : 600 - 1350 models
1 : P200 - P500YKB models
2 : P400 - P900 YSKB models
3 : P950 - P1350 YSKB models
Total number of
indoor units
Total number of
LOSSNAY units
(During auto
address
start-up only)
Total number of
outdoor units