Check SiUS04-924
106 Service Diagnosis
5. Check
5.1 How to Check
5.1.1 Fan Motor Connector Output Check
Check No.01 1. Check connector connection.
2. Check motor power supply voltage output (pins 4-7).
3. Check motor control voltage (pins 4-3).
4. Check rotation command voltage output (pins 4-2).
5. Check rotation pulse input (pins 4-1).
5.1.2 Electronic Expansion Valve Check
Check No.04 Conduct the following 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, 2, 3, 4 and 6. 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 3, 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.
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