Mitsubishi Electric PURY-EP200YLM-A, Service Handbook, Page: 299 / 434

[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
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HWE1314A GB
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 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.

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)
(5) Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
(6) In a system with the P700 models of units or larger,
a BC controller other than the HA1-type is used as
the main BC controller.
Restriction on the number of units
Number of units
0 or 1
0 or 1
1
((E)P200 - (E)P350 models only)
0,1 or 2
1 - 20 : (E)P200 model
1 - 25 : (E)P250 model
1 - 30 : (E)P300 model
1 - 35 : (E)P350 model
1 - 40 : (E)P400 model
1 - 45 : (E)P450 model
1 - 50 : (E)P500 model
2 - 50 : (E)P550 model
2 - 50 : (E)P600 model
2 - 50 : (E)P650 model
2 - 50 : (E)P700 model
2 - 50 : (E)P750 model
2 - 50 : (E)P800 model
2 - 50 : (E)P850 model
2 - 50 : (E)P900 model
1 : (E)P200 - (E)P500 YLM models
2 : P400 - P900 YSLM models
EP500 - EP900 YSLM models
Total number of indoor units
Total number of LOSSNAY
units (During auto address
start-up only)
Number of Sub BC controllers
Number of
Main BC controllers
Number of BC controllers
Total number of outdoor units