Table of Contents
[8-8 Troubleshooting LEV Problems ]
8-8-2
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%.
Incomple seal-
When checking the refrigerant leak from the indoor LEV,
ing
run the target indoor unit in the fan mode, and the other in-
(leak from the
door units in the cooling mode. Then, check the liquid tem-
valve)
perature (TH22) with the self-diagnosis LED. When the unit
is running in the fan mode, the LEV is fully closed, and the
temperature detected by the thermistor is not low. If there is
a leak, however, the temperature will be low. If the temper-
ature is extremely low compared with the inlet temperature
displayed on the remote controller, the LEV is not properly
sealed, however, if there is a little leak, it is not necessary
to replace the LEV when there are no effects to other parts.
Faulty wire
1
connections in
.
the connector
2
or faulty con-
.
tact
HWE1314A
Judgment method
LED
1 k
Thermistor
(liquid piping
temperature detection)
Linear Expansion Valve
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
If there is a large
amount of leakage, re-
place the LEV.
Check the continuity at
the points where an er-
ror occurs.
- 324 -
Remedy
LEV
Indoor unit,
Outdoor unit
and BC control-
ler
Indoor unit,
Outdoor unit
and BC control-
ler
(LEV5a,5b) and
BC control-
ler(LEV3,
LEV1(G1 type)
BC control-
ler(LEV1(GA1,
HA1 type)
Indoor unit
Indoor unit,
Outdoor unit
and BC control-
ler
GB
Chapters
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Troubleshooting
