MXZ-SM48NAMHZ Service Manual

104
OCH789
Check code
Abnormal points and detection methods Causes and checkpoints
When the total capacity of connected indoor units exceeds the specied
capacity (130% of the outdoor unit capacity), a check code <7100> is
displayed.
The total capacity of connected indoor units exceeds
the specied capacity (without Branch Box / with
Branch Box).
· SM36: up to code 32/29
· SM42: up to code 35/35
· SM48: up to code 43/40
· SM60: up to code 56/53
The model name code of the outdoor unit is
registered wrongly.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
7100
(EF)
Total capacity error
No
Yes
Yes
No
No
Yes
Is it set properly?
Is it set properly?
Is the total under 130% of outdoor
unit capacity?
Check the capacity code switch (SW2
on the indoor controller board) on the
connected indoor unit.
Check the model selection switch (SW4 on
the outdoor controller board) of the outdoor
unit.
Check the total capacity of connected
indoor units.
Correct it so that the total capacity of
connected indoor units is under 130% of
the outdoor unit capacity.
Set the switch properly.
Set the switch properly.
Complete.