Self-Diagnosis Action Table - Mitsubishi Electric Mr.Slim PUH-P25VGAA Service Manual

10-4. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is put 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. Three seconds after power on, judge
F1
reverse phase by detecting voltage
(4103)
phase of each phase.
2. Abnormal four 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 two seconds after
(4102)
power on.
63L connector open
Abnormal if 63L connector circuit is open
for three minutes continuously after power
supply.
F3
63L: Low-pressure switch
(5202)
(PU/PUH-P125, 140YGAA.UK Only.)
The connector of 49C is open
Consider the unit abnormal when the cir-
cuit of connector (49C) remains open for
three consecutive minutes with the power
F4
on.
(4124)
49C: Inner thermostat (Compressor)
Reverse phase detector circuit
(controller board) fault
F7
Abnormal if some of each phase detection
(4118)
signal is not input three seconds after
power supply.
2 or more connectors open
Abnormal if two more out of connector
(63L, 49C, 51CM) circuits are open for
three minutes continuously after power on.
F9
(4119)
51CM connector open
Abnormal if 51CM connector circuit is open
for three minutes continuously after power
on.
FA
51CM: Thermal Relay
(4108)
(Note 1) The number in ( ) is the error cord of upper remote controller (M-NET)
1 No voltage is supplied to termi-
nal block (TB1) of indoor unit.
a) Power supply breaker is put
off.
b) Contact failure or discon-
nection of power supply ter-
minal
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 fail-
ure of 63L connector on out-
door controller board
2 Disconnection or contact fail-
ure of 63L
3 63L is working due to refrigerant
leakage or defective parts.
4 Defective outdoor controller
board
1 The connector of 49C on out-
door controller board has con-
tact failure or disconnection.
2 The switch of 49C has contact
failure or disconnection.
3 Power supply was turned on
when 49C has been tripped.
4 49C has been tripped (defec-
tive parts).
5 Outdoor controller board is
defective.
Detective outdoor controller
board
1 Disconnection or contact fail-
ure of connector (63L, 49C,
51CM) on outdoor controller
board
2 Disconnection or contact fail-
ure of (63L, 49C, 51C).
3 Defective (63L, 49C, 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
Case
1
• Check outdoor power supply connection
• 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.
1 Check connection of 49C connector on
2 Check the 49C side of connecting wire.
34
5 Replace the outdoor controller board.
Replace outdoor controller board.
1 Check connection of (63L, 49C, 51CM)
2 Check the (63L, 49C, 51CM) side of
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)
(TB1)
and phase L2) out of three phases of outdoor
power supply line (TB1)
outdoor controller board.
Refer to 10-7.
Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.
outdoor controller board.
Refer to 10-7.
Check the continuity by tester.
Replace defective parts.
connector on outdoor controller board.
Refer to 10-7.
connecting 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.