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[
IX
Troubleshooting ]
(3) Judgment methods and possible failure mode
Note:
The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ.Therefore, remedies for
each failure may vary. Check the remedy specified for the appropriate LEV as indicated in the right column.
Malfunction
mode
Judgment method
Remedy
Target LEV
Microcomputer
driver circuit fail-
ure
Disconnect the control board connector and
connect the check LED as shown in the figure
below.
When the main power is turned on, the indoor
board or the outdoor MAIN board outputs
pulse signals to the indoor LEV for 10 sec-
onds, and to the outdoor LEV for 17 seconds.
If the self-diagnosis LED is not lit, or remains
lit, the driver circuit has a problem.
When the drive circuit has a prob-
lem, replace the control board.
Indoor
Outdoor
LEV mechanism
is locked
If the LEV is locked, the drive motor runs idle, and
makes a small clicking sound.
When the valve makes a closing and opening
sound, the valve has a problem.
Replace the LEV.
Indoor
Outdoor
Disconnected or
short-circuited
LEV motor coil
Measure resistance between the coils (red -
white, red -orange, brown - yellow, brown - blue)
using a tester. They are normal if resistance is
150
10%.
Replace the LEV coils.
Indoor
Measure resistance between the coils (red -
white, red -orange, brown - yellow, brown - blue)
using a tester. They are normal if resistance is 46
within 3%.
Replace the LEV coils.
Outdoor
Incomple sealing
(leak from the
valve)
When checking the refrigerant leak from the in-
door LEV, run the target indoor unit in the fan
mode, and the other indoor units in the cooling
mode. Then, check the liquid temperature (TH22)
with the self-diagnosis LED. When the unit is run-
ning 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 temperature 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.
If there is a large amount of leak-
age, replace the LEV.
Indoor
Faulty wire con-
nections in the
connector or
faulty contact.
1.Check for loose pins on the connector and
check the colors of the lead wires visually
2.Disconnect the control board's connector and
conduct a continuity check using a tester.
Check the continuity at the points
where an error occurs.
Indoor
Outdoor
6
5
4
3
2
1
1 k
LED
Thermistor
(liquid piping temperature detection)
Linear Expansion Valve
Содержание PUHY-P168
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Страница 99: ... 90 III Outdoor Unit BC Controller Components 2 RELAY BOARD RELAY 4 board 3 RELAY BOARD RELAY 10 board ...
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Страница 126: ... 117 VI Refrigerant Circuit 1 Refrigerant Circuit Figure 119 2 Principal Parts and Functions 126 ...
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Страница 134: ... 125 VI Refrigerant Circuit 3 CMB P104 and P108NU GB sub TH25 TH22 LEV3a CP Solenoid valves Block Check valves Block ...
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Страница 366: ... 357 IX Troubleshooting ...
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Страница 368: ... 359 X LED monitor display on the outdoor unit board 1 How to read the LED on the service monitor 361 ...
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