Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 84

Check code
5300
(UH)
Abnormal points and detection methods
Abnormal if any of the following conditions is detected:
1 Primary current sensor detects any of the following conditions (single
phase unit only):
Ambient 10 consecutive-
temperature second detection
TH7 > 3:
TH7 [ 3:
2 Secondary current sensor detects 25 A or more.
3 Secondary current sensor detects 1.0 A or less.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Check the power specification of the
outdoor unit.
Is the power supply single phase?
No
(Three-phase)
Does it satisfy the condition 1?
Check the value on the secondary current
sensor during the error.
Does it satisfy the
condition 2 or 3?
No
OCH632A
Primary current error
One-time detection
37 A 40 A
40 A 43A
Diagnosis
Yes
(Single-phase)
No
Check the compressor
Yes
wiring.
Is there any abnormality
such as a disconnection,
looseness, or breakage?
No
Causes and check points
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.
The power supply voltage might be
decreased or abnormal.
Check the power supply facility.
The secondary current sensor value during the error can be displayed
by an operation of SW1 on the outdoor multi controller circuit board.
SW1 Setting Display on LED1, 2
ON
0–999.9
OFF
1 2 3 4 5 6 7 8
Yes Connect the compressor wiring properly.
Replace the outdoor power circuit board
(Malfunction of current sensor circuit).
84
Remedy
Unit
Arms