Electronic Expansion Valve Check - Daikin Altherma EKHBH Series Service Manual

ESIE06-03
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
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
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
Please note that the latching sound varies depending on the valve type.
Note
Part 3 – Troubleshooting
connector number.
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.
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.
Additional Checks for Troubleshooting
Harness 6P
Check
6P Connector
1 2 3 4 5 6
5-2
5-4
6-1
6-3
1
3 3
4
5
3–51