Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 84

7105 (EF): Address setting error
Abnormal points and detection methods
The address setting is wrong.
Diagnosis of failure
<Outdoor unit>
Check whether the outdoor unit address is set in
000, or in the range of 51 to 100.
<Indoor unit>
Check whether the indoor unit address is set in
00, or in the range of 01 to 50.
<Branch box>
Check whether the branch box address is set in
00, or in the range of 01 to 46.
Note: Branch box address
OCH800A_84
Is the address setting correct?
Yes
Is the address setting correct?
Yes
Is the address setting correct?
Yes
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.
Causes and checkpoints
There is a unit without correct address setting in the range
specified in the installation manual.
Set the address properly, then turn the power
No
OFF of indoor/outdoor unit, Fresh Master,
Lossnay and remote controller simultaneously
for 2 minutes or more, and turn the power back
ON.
Replace the outdoor multi controller circuit
board.
Set the address properly, then turn the power
No
OFF of indoor/outdoor unit, Fresh Master,
Lossnay and remote controller simultaneously
for 2 minutes or more, and turn the power back
ON.
Replace the indoor controller board.
Set the address properly, then turn the power
No
OFF of indoor/outdoor unit, Fresh Master,
Lossnay and remote controller simultaneously
for 2 minutes or more, and turn the power back
ON.
Replace the branch box controller board.
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