MXZ-SM48NAMHZ Service Manual

OCH789

Check code

●Diagnosis of defects

Make sure to turn the power OFF before connecting/disconnecting

any connectors, or replacing boards.

Diagnosis Remedy

6607

(A7)

No ACK error

Chart 3 of 4

Note:

When the address of the outdoor unit is displayed as abnormal, the

outdoor circuit board may be faulty. If the unit is not restored after

conducting the following procedure, check the outdoor circuit board.

Yes

The transmission line is connected

properly.

It is not exceeding the tolerance.

Check the transmission line whether it

exceeds the tolerance(*) or not.

Check whether the correct kind of

transmission line is used or not.

Correct it within the tolerance, then perform

the procedure 1.

Connect the transmission line properly,

then perform the procedure 1.

Is the abnormality replicated?

Is it set properly?

There is no abnormality on the AC unit.

It might be caused by an external noise, so check the

transmission line to remove the factor(s).

Set the address properly, then perform the

procedure 1.

Check the address switch on the source of

abnormality.

Check the transmission line for a

disconnection and looseness

(on the terminal board and connector).

Turn the power OFF of indoor/outdoor unit, Fresh

Master, Lossnay and remote controller simultaneously

for 2 minutes or more, then turn the power back ON.

Procedure 1:

Continue to the next page.

*For the tolerance, refer to the

Installation Manual.