Possible Problems And Solutions - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[8-8 Troubleshooting LEV, FCV Problems ]
8-8-3

Possible Problems and Solutions

Malfunction
mode
Microcomput- Disconnect the control board connector and connect the
er driver circuit check LED as shown in the figure below.
failure
resistance : 0.25W 1kΩ
LED : DC15V 20mA or more
When the main power is turned on, the indoor unit circuit
board outputs pulse signals to the indoor unit LEV for 10
seconds.
If any of the LED remains lit or unlit, the drive circuit is faulty.
LEV mecha- If the LEV is locked, the drive motor runs idle, and makes a
nism is locked small clicking sound.
When the valve makes a closing and opening sound, the
valve has a problem.
Disconnected Measure resistance between the coils (red - white, red -or-
or short-circuit- ange, red - yellow, red - blue) using a tester. They are nor-
ed LEV motor mal if resistance is 100Ω ± 10%.
coil
Measure resistance between the coils (red - white, red -or-
ange, brown - yellow, brown - blue) using a tester. They are
normal if resistance is 150Ω ± 3%.
Faulty wire 1
connections in .
the connector
2
or faulty con-
.
tact
BS_08_L
Judgment method
1 k LED
Check for loose pins on the connector and check the
colors of the lead wires visually
Disconnect the control board's connector and conduct a
continuity check using a tester.
When the drive circuit
has a problem, replace
the control board.
6
5
4
3
2
1
Replace the LEV.
Replace the LEV coils. Outdoor unit
Replace the LEV coils. Indoor unit and
Check the continuity at
the points where an er-
ror occurs.
Remedy LEV
Indoor unit,
Outdoor unit
and HBC con-
troller
Indoor unit,
Outdoor unit
and HBC con-
troller
(LEV2a,2b and
2d) and HBC
controller
(LEV3)
HBC controller
(LEV1, LEV3)
Indoor unit,
Outdoor unit
and HBC con-
troller
chapter 8 -
29