Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

Page: 144 / 215

- 135 -
[
IX
Troubleshooting ]
3. System error
Error
Code
Error source
Error definition and error
detection method
Cause Check method and remedy
7100 Outdoor unit Total capacity error
The model total of indoor
units in the system with
one outdoor unit exceeds
limitations.
The model total of indoor units
in the system with one outdoor
unit exceeds the following ta-
ble. 1) Check the model total (capacity
code total) of indoor units con-
nected.
2) Check the model name (capaci-
ty code) of the connected indoor
unit set by the switch (SW2 on
indoor unit board).
When the model name set by the
switch is different from that of the
unit connected, turn off the power
source of the outdoor and the indoor
units, and change the setting of the
model name (capacity code).
7101 Outdoor unit
Indoor unit Capacity code error
The model name (capac-
ity code) of the connect-
ed indoor unit connected
is inappropriate.
(1) The model names (model
codes) of the connected
indoor units are out of con-
nectable range.
Connectable range
P250 (P250 model)
P500 (P500 model)
(2) The model name (capacity
code) set by the switch
(SW2) is wrong.
1) Check the model names (model
codes) of the connected indoor
units.
2) Check the model name (capaci-
ty code) of the indoor unit which
has the error source address set
by the switch (SW2 on indoor
unit board).
When the model name set by the
switch is different from that of the
unit connected, turn off the pow-
er source of the outdoor and the
indoor units, and change the set-
ting of the capacity code.
*The capacity of the indoor unit can
be confirmed by the self-diagnosis
function (SW1 operation) of the out-
door unit.
7102 Outdoor unit Error in the number of
connected units
The number of connect-
ed indoor units exceeds
the allowable range.
(1) Number of indoor units
connected to the outdoor
terminal block (TB3) for in-
door/outdoor transmission
lines exceeds limitations
described below.
(2) Disconnected transmis-
sion line of the outdoor unit
(3) Short-circuited transmis-
sion line
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) 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 transmis-
sion line (TB3).
7105 Outdoor unit Address setting error
Erroneous setting of OC
unit address
Erroneous setting of OC unit
address
The address of outdoor unit is
not being set to 51 - 100. Check that the address of OC unit is
set to 51- 100. Reset the address if it
stays out of the range, while shutting
the power source off.
Capacity Total Model
P250
P500 280
560
Restriction on the
number of units
Number of units
Total number of
indoor units
Air-cooled=1