Troubleshooting; How To Check The Parts - Mitsubishi Electric PKFY Series Technical & Service Manual

9

TROUBLESHOOTING

9-1. HOW TO CHECK THE PARTS

PKFY-P04NLMU-E.TH
PKFY-P12NLMU-E.TH
Parts name
Room temperature
detection thermistor (TH21)
Pipe temperature detection
thermistor/liquid (TH22)
Pipe temperature detection
thermistor/gas (TH23)
Vane motor (MV1)
Sky Blue
7
M
Sky Blue
9
Red
10
Sky Sky
Connector(CNV)
Blue Blue
pin No.
6 8
Vane motor (Lower (MV2))
Sky Blue
2
M
Sky Blue
4
Red
5
Sky Sky
Connector(CNV)
Blue Blue
pin No.
1 3
Fan motor (MF)
Linear expansion valve (LEV)
CN60
White
1
Yellow
2
Orange
3
LEV Blue
4
Red
5
Brown
6
Drain pump (DP)
1 RD
2
VT
3
BK
(Optional parts)
Drain float switch (FS)
Moving part
1
2
3
(Optional parts) 4
OCH715
PKFY-P06NLMU-E.TH
PKFY-P15NLMU-E.TH
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature 10 to 30:)
Normal
Refer to "8-1-1. Thermistor".
4.3 to 9.6 k"
Measure the resistance between the terminals with a tester. (At the ambient temperature 25:)
Normal
-9 -8
10 10
Red-Sky Blue Red-Sky Blue Red-Sky Blue
300 "±7%
Measure the resistance between the terminals with a tester. (At the ambient temperature 25:)
Normal
5-4 5-3
Red-Sky Blue Red-Sky Blue
Red-Sky Blue
300±26.3 "
Refer to "8-1-3. DC Fan motor (fan motor/indoor controller board)
Disconnect the connector then measure the resistance valve with a tester. (Coil temperature 20:)
Normal
(1)-(5) (2)-(6)
White-Red Yellow-Brown Orange-Red
200 "±10%
1 Check if the drain float switch works properly.
2 Check if the drain pump works and drains water properly in cooling operation.
3 If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the
operation starts.
Note: The drain pump for this model is driven by the internal DC motor, so it is not possible to
measure the resistance between the terminals.
Normal: Red–Black: Input 13 V DC → The pump motor starts to rotate.
Measure the resistance between the terminals with a tester.
State of moving part Normal
Short
UP
Open
DOWN
Short
–
PKFY-P08NLMU-E.TH
PKFY-P18NLMU-E.TH
Check points
-7 -6
10 10
Red-Sky Blue
5-2 5-1
Red-Sky Blue
(3)-(5) (4)-(6)
Blue-Brown
Abnormal
Other than short
Other than open
Other than short
27 27
Drain float switch
connector terminal
1(+) – 2(-)
1(+) – 2(-)
3(+) – 4(-)
Magnet
Moving
Part