Service manual

ESIE03–01 Additional Checks for Troubleshooting

Part 3 – Troubleshooting 3–77

5.7 Outdoor Unit: Checking the Expansion Valve

Checking To check the electronic expansion valve, proceed as follows:

Step Action

1 Check if the expansion valve connector is correctly inserted in the X24A of PCB 1.

2 Compare the expansion valve unit with the number of the connector to make sure it is cor-

rectly connected.

3 Switch the power OFF.

4 Switch the power ON to check whether the expansion valve is producing a clicking sound.

5 Check the coil current: Open circuit < normal < short circuit

6 Check the clicking sound again.

If... Then...

The expansion valve has no

clicking sound

Disconnect the valve connector without the

clicking sound and proceed to step 5.

The table below contains the reference resistance values.

—

Grey Black Yellow Red Orange

Grey

— 40-50 ø 40-50 ø 40-50 ø 40-50 ø

Black

40-50 ø — 80-100 ø 80-100 ø 80-100 ø

Yellow

40-50 ø 80-100 ø — 80-100 ø 80-100 ø

Red

40-50 ø 80-100 ø 80-100 ø — 80-100 ø

Orange

40-50 ø 80-100 ø 80-100 ø 80-100 ø —

If... Then...

There is a clicking sound The expansion valve works properly.

There is no clicking sound Replace the expansion valve unit.

There is still no clicking sound Replace outdoor PCB 1.