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SiBE04-101
Checks
Service Diagnosis
125
5.1.10 Discharge Pressure Check
Check No.19
5.1.11 Electronic Expansion Valve Check
Check No.20
Conduct the followings to check the electronic expansion valve (EV).
1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the
connector number.
2. Turn the power off and back on again, and check to see if all the EVs generate latching sound.
3. If any of the EVs does not generate latching noise in the above step 2, disconnect that connector and
check the conductivity using a tester.
Check the conductivity between pins 1, 3 and 6, and between pins 2, 4 and 5. If there is no conductivity
between the pins, the EV coil is faulty.
4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty.
5. If the conductivity is confirmed in the above step 2, mount a good coil (which generated latching sound)
in the EV unit that did not generate latching sound, and check to see if that EV generates latching
sound.
∗
If latching sound is generated, the outdoor unit PCB is faulty.
∗
If latching sound is not generated, the EV unit is faulty.
Note:
Please note that the latching sound varies depending on the valve type.
Discharge pressure check
Open the stop valve.
Replace the pipe installed at
the site.
Clean.
Replace the compressor.
Replace compressor.
(R1081)
YES
YES
YES
NO
NO
NO
At the heat exchanger and
air filter dirty?
Is the stop valve open?
Is the
connection pipe deformed?
YES
NO
High
Harness 6P
6P Connector
Check
5-2
5-4
6-1
6-3
1 2 3 4 5 6
(R1082)
SiBE04-101.book Page 125 Monday, October 15, 2001 3:08 PM