Daikin Altherma EKHBH Series, Service Manual

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ESIE06-03 Additional Checks for Troubleshooting
Part 3 – Troubleshooting 3–51
3 3
4
5
1
5.3 Electronic Expansion Valve Check
Check No.04 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.
P
If latching sound is generated, the outdoor unit PCB is faulty.
P
If latching sound is not generated, the EV unit is faulty.
Note
Please note that the latching sound varies depending on the valve type.
Harness 6P
6P Connector
Check
5-2
5-4
6-1
6-3
1 2 3 4 5 6