Self-Diagnosis Action Table; Abnormalities Detected When The Power Is Turned On - Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual

11-4. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is turned on>
Error Code Meaning of error code and detection method
None
Reverse phase detection, Power supply
and indoor/outdoor unit connecting wire
converse connection
1. 3 seconds after power on, judge reverse
F1
phase by detecting voltage phase of
(4103)
each phase.
2. Abnormal 4 minutes after power on if
power supply and indoor/outdoor unit
connecting wire have converse connection.
L3-phased open phase detection
F2
Detect open phase 2 seconds after power
(4102)
on.
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously after power
supply.
F3
63L: Low-pressure switch
(5202)
(PU(H)-P125, 140 only)
Reverse phase detector circuit
(controller board) fault
F7
Abnormal if some of each phase detection
(4118)
signal is not input 3 seconds after power
supply.
2 or more connectors open
Abnormal if two more out of connector (63L,
51CM) circuits are open for 3 minutes
continuously after power on.
F9
(4119)
51CM connector open
Abnormal if 51CM connector circuit is open
for 3 minutes continuously after power on.
51CM: Thermal Relay
FA
(4108)
OC379F
1 No voltage is supplied to
terminal block (TB1) of indoor
unit.
a) Power supply breaker is off.
b) Contact failure or
disconnection of power
supply terminal
c) L1-phased open phase
2 Electric power is not charged
to power supply terminal of
—
controller board.
a) Contact failure of power
supply terminal
b) Disconnection of terminal R
or 4/S on controller board
3 Defective outdoor controller
board
a) Fuse 6.3A on controller
board is blown.
b) Defective parts
1 L1, L2, L3 are not connected
correctly.
2 Converse wiring of outdoor
power supply line (TB1) and
indoor power supply wire (TB4)
1 L3-phased open-phase
1 Disconnection or contact
failure of 63L connector on
outdoor controller board
2 Disconnection or contact
failure of 63L
3 63L is working due to refrigerant
leakage or defective parts.
4 Defective outdoor controller
board
Defective outdoor controller
board
1 Disconnection or contact failure
of connector (63L, 51CM) on
outdoor controller board
2 Disconnection or contact
failure of (63L, 51C)
3 Defective (63L, 51C) (defective
parts)
4 Defective outdoor controller
board
1 Disconnection or contact
failure of 51CM connector on
outdoor controller board
2 Disconnection or contact
failure of 51CM
3 Defective 51CM (defective
parts)
4 Defective outdoor controller
(Note 1) The number in ( ) is the error cord of upper remote controller (M-NET)
Case
1
• Check outdoor power supply connection (TB1)
• Replace two phases (for example phase L1
2 Check wiring connection.
1 Check power supply.
1 Check connection of 63L connector on
2 Check the 63L side of connecting wire.
3 Check refrigerant pressure.
4 Replace outdoor controller board.
Replace outdoor controller board.
1 Check connection of (63L, 51CM) connector
2 Check the (63L, 51CM) side of connecting
3 Check continuity by tester.
4 Replace outdoor controller board.
37
Judgment and action
1 Check following items.
a) Power supply breaker
b) Connection of power supply terminal block
(TB1)
c) Connection of power supply terminal block
(TB1)
2 Check following items.
a) Connection of power supply terminal block
(TB1)
b) Connection of terminal on controller board
3 Replace following items.
a) Fuse 6.3A
b) Controller board (When items above are
checked but the units can not be repaired)
and phase L2) out of three phases of outdoor
power supply line (TB1)
outdoor controller board.
Refer to 11-7.
Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.
on outdoor controller board.
Refer to 11-7.
wire.
Replace the parts if the parts are defective.
1 Check connecting wire.
2 Check connecting wire.
3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller board.