MXZ-SM36NAMHZ Service Manual

90
OCH789
Check code
Abnormal points and detection methods Causes and checkpoints
If any of the following conditions is detected:
1
Primary current sensor detects any of the following conditions (single
phase unit only):
2
Secondary current sensor detects 25 A or more.
3
Secondary current sensor detects 1.0 A or less.
Decrease/trouble of power supply voltage
Disconnection of compressor wiring
Current sensor trouble on outdoor power circuit
board
Wiring through current sensor (penetration type) is
not done.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
5300
(UH)
Primary current error
Model name
10 consecutive-
second detection
One-time detection
MXZ-SM36/48NAM 34 A 38 A
MXZ-SM36/42/48NAMHZ
MXZ-SM60NAM
37 A 40 A
(Three-phase)
Yes
Yes
No
No
Yes
No
Is the power supply single phase?
Is there any abnormality
such as disconnection,
looseness, or breakage?
The power supply voltage might be
decreased or abnormal.
Check the power supply facility.
Connect the compressor wiring properly.
Replace the outdoor power circuit board
(Malfunction of current sensor circuit).
Check the power specication of the
outdoor unit.
Check the value on the secondary current
sensor during the error.
(Single-phase)
Does it satisfy the condition
1
?
No
SW1 Setting
ON
OFF
Display on LED1, 2 Unit
0–999.9
Arms
41 2 5 6 7 83
The secondary current sensor value during the error can be displayed
by an operation of SW1 on the outdoor multi controller circuit board.
Does it satisfy the
condition
2
or
3
?
Check the compressor wiring.