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

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

Possible Problems and Solutions

The specifications of the outdoor unit (outdoor LEV) and the Hydro unit (Hydro LEV) differ. Therefore, remedies for each failure
may vary. Check the remedy specified for the appropriate LEV as indicated in the below column.
Malfunction
mode
Microcomputer Disconnect the control board connector and connect the check
driver circuit fail- LED as shown in the figure below.
ure
Resistance : 0.25W 1kΩ
LED : DC15V 20mA or more
When the main power is turned on, the Hydro unit circuit board
outputs pulse signals to the Hydro unit LEV for 10 seconds, and
the outdoor unit circuit board outputs pulse signals to the outdoor
unit LEV for 17 seconds.
If any of the LED remains lit or unlit, the drive circuit is faulty.
LEV mechanism If the LEV is locked, the drive motor runs idle, and makes a small
is locked clicking sound.
When the valve makes a closing and opening sound, the valve
has a problem.
Disconnected or Measure the resistance between coils (red-white, red-orange,
short-circuited brown-yellow, brown-blue) with a tester. When the resistance is
LEV motor coil in the range of 150Ω ± 10%, the LEV is normal.
Measure the resistance between coils (red-white, red-orange,
red-yellow, red-blue) with a tester. When the resistance is in the
range of 100Ω ± 10%, the LEV is normal.
Measure the resistance between coils (red - white, red - orange,
brown - yellow, brown - blue) with a tester. When the resistance
is in the range of 46Ω ± 3%, the LEV is normal.
Faulty wire con- 1. Check for loose pins on the connector and check the col-
nections in the ors of the lead wires visually
connector or
2. Disconnect the control board's connector and conduct a
faulty contact
continuity check using a tester.
BS_08_E
Judgment method
6
5
4
3
2
1
1 k LED
Remedy
When the drive circuit has a
problem, replace the control
board.
Replace the LEV.
Replace the LEV coils.
Replace the LEV coils.
Replace the LEV coils.
Check the continuity at the
points where an error occurs.
Target
LEV
Hydro
Outdoor
Hydro
Outdoor
Hydro
Outdoor
(LEV2a,
LEV2b,
LEV2c)
Outdoor
(LEV1,
LEV4,
LEV9)
Hydro
Outdoor
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