Troubleshooting
Si10-417
152
Service Diagnosis
Check No.4
(for Multi
System)
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.
Si10-417.fm Page 152 Wednesday, September 22, 2004 6:38 PM
