Mitsubishi Electric City Multi PUHY-P500YSHM-A Service Handbook page 153

[ X 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)
(2)
(3)
Note1: Do not connect the indoor unit to an outdoor unit other than the PUHY-P500YSHM-A.
Note2: Be sure to connect the indoor unit and outdoor unit on a one-to-one basis.
HWE07150
Cause
The model total of indoor units in the sys-
tem with one outdoor unit exceeds the fol-
lowing table.
Model
Capacity Total
500 model
The model selection switches (SW5-1 - 5-
4) on the outdoor unit are set incorrectly.
SW5
Model
1 2
250 model
ON ON OFF OFF
The outdoor unit and the auxiliary unit
(OS) that is connected to the same system
are not properly connected.
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).
650
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).
3 4
Confirm that the TB3 on the OC and OS are
properly connected.
- 144 -
Check method and remedy
GB