Mitsubishi Electric PUHY-P72 Service Manual page 219

[ IX Troubleshooting ]
1. Error Code
7100
Total capacity error
2. Error definition and error detection method
The model total of indoor units in the system with one outdoor unit exceeds limitations.
3. Error source, cause, check method and remedy,
Error source
Outdoor unit (1) The model total of indoor units in the sys-
tem with one outdoor unit exceeds the fol-
lowing table.
(2) The model selection switches (SW5-1 - 5-
4) on the outdoor unit are set incorrectly.
(3) The outdoor unit and the auxiliary unit
(OS) that is connected to the same system
are not properly connected.
HWE0804A
Cause
Capacity Total
Model
72 model 96
96 model 124
120 model 156
144 model 187
168 model 218
192 model 249
216 model 280
240 model 312
264 model 343
288 model 374
312 model 405
336 model 436
360 model 468
SW5
Model
1 2 3 4
72 model
OFF ON OFF OFF
96 model ON ON OFF OFF
120 model
OFF OFF ON OFF
- 210 -
Check method and remedy
1) Check the model total (capacity code total) of in-
door units connected.
2) Check the model name (capacity code) of the
connected indoor unit set by the switch (SW2 on
indoor unit board).
When the model name set by the switch is differ-
ent 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 (ca-
pacity code).
Check the setting for the model selection switch
on the outdoor unit (Dipswitches SW5-1 - 5-4 on
the outdoor unit control board).
Confirm that the TB3 on the OC and OS are
properly connected.
GB