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Mitsubishi Electric PURY-80TMU Service Handbook page 78

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(Self-diagnostic monitor)
Measured Data
LEV1 pulse
LEV 3 pulse
BC controller bypass
output superheat
BC controller
intermediate subcool
BC controller liquid
subcool
(Solenoid Valve Troubleshooting Flow)
Start
Visually check for disconnection between connec-
tors and terminals, and confirm correct lead colors.
Intermediate
connector
2
Brown
5
Red
1
Blue
To
LEV
3
Orange
4
Yellow
6
White
OK?
Yes
Remove connectors from the board and
use a tester to check conduction.
• Check between connectors 1-3-5 and 2-
4-6.
OK?
Yes
Use a tester to measure resistance
between each coil (red-white, red-orange,
brown-yellow, brown-blue).
Correct value is: 150Ω±10%
OK?
Yes
Signal OUTDOOR MAIN board SW1 Setting
1
2 3 4 5 6 7 8 9 10
–
ON
1
2 3 4 5 6 7 8 9 10
–
ON
–
1
2 3 4 5 6 7 8 9 10
SH12
ON
1
2 3 4 5 6 7 8 9 10
SC16
ON
1
2 3 4 5 6 7 8 9 10
SC11
ON
Controller
board
6
Brown
5
Red
4
Blue
3
Orange
2
Yellow
1
White
No
Correction.
No
Adjust, repair.
No
Change LEV
Check for the following:
LEV full open: ticking sound
LEV full closed: no sound
Confirm if LEV is closed fully.
Attach check LEDs
illustrated nearby to board
connectors and confirm
that LEDs light for 10
seconds.
–77–
No
OK?
Yes
Change LEV
No
OK?
Yes
Change LEV
6
5
4
3
2
1
10kΩ LED
No
OK?
Yes
Change the
board.
End
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