Mitsubishi Electric PUMY-P36NKMU4 Technical & Service Manual page 106

Check code
7105
(EF)
Abnormal points and detection methods
The address setting of outdoor unit or branch box is wrong.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
<Outdoor unit>
Check whether the outdoor unit address is
set in 000, or in the range of 51 to 100.
Is the address setting correct?
<Branch box>
Check whether the branch box address is
set in 000, or in the range of 001 to 050.
Is the address setting correct?
Note: Branch box address
When setting the address, use a number within the range of 1–50.
Ex. The set address is (47) and there are 5 indoor units (A, B, C, D, and E).
If A: (47), B: (48), C: (49), D: (50), and E: (51), E is incorrect because it exceeds 50.
OCH811A
Address setting error
Diagnosis
Yes
Yes
Causes and checkpoints
Wrongly set address of branch box
The outdoor unit is not set in 000, or in the range of 51
to 100.
Set the address properly, then turn the
power OFF of indoor/outdoor unit, Fresh
Master, Lossnay and remote controller
No
simultaneously for 2 minutes or more, and
turn the power back ON.
Replace the outdoor controller board.
Set the address properly, then turn the
power OFF of indoor/outdoor unit, branch
box, Fresh Master, Lossnay, and remote
No
controller simultaneously for 2 minutes or
more, and turn the power back ON.
Replace the branch box controller board.
106
Remedy