MITSUBISHI ELECTRIC P500YMF-C - Manual (Page 98)

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6
6
5
4
3
2
1
5
4
3
2
1
2
5
1
3
4
6 Brown
Red
Blue
Orange
Yellow
White
Brown
Red
Blue
Orange
Yellow
White
To
LEV
10k
Ω
LED
(Self-diagnostic monitor)
Measured Data Signal OUTDOOR MAIN board SW1 Setting
LEV1 pulse
LEV 3 pulse
LEV 3a pulse
BC controller bypass
output superheat
BC controller
intermediate subcool
BC controller liquid
subcool
(Solenoid Valve Troubleshooting Flow)
–
–
–
SH12
SC16
SC11
Start
Visually check for disconnection between connec-
tors and terminals, and confirm correct lead colors.
Intermediate
connector Controller
board
Remove connectors from the board and
use a tester to check conduction.
• Check between connectors 1-3-5 and 2-
4-6.
Use a tester to measure resistance
between each coil (red-white, red-orange,
brown-yellow, brown-blue).
Correct value is: 150
Ω± 10%
Adjust, repair.
Check for the following:
LEV full open: ticking sound
LEV full closed: no sound
Change LEV
OK?
Confirm if LEV is closed fully.
Attach check LEDs
illustrated nearby to board
connectors and confirm
that LEDs light for 10
seconds.
Change the
board.
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
1
ON
2 3 4 5 6 7 8 9 10
OK?
OK?
Change LEV
Correction.
OK?
OK?
Change LEV
OK?
End
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
1
ON
2 3 4 5 6 7 8 9 10