Daikin FTXN25L Service Manual page 82

6.2 Electronic Expansion Valve (EXV) checking procedures
a. Check if the EXV connector is correctly connected to PCB.
b. Turn power off and on again, and check if EXV generates a latching sound.
c. If the EXV does not generate a latching sound in above step b., disconnect connector and check
continuity using a multimeter.
d. Check the continuity between pins [1-6, 3-6, 2-5, 4-5 (between pins 1-6, 2-6, 3-6, 4-6 for harness 5P
models)]. If there is no continuity between the pins, EXV coil is faulty.
e. If the continuity is confirmed in step d., outdoor PCB is faulty.
Harness 6P
6P Connector
S 2 0
1 2 3 4
6.3 Four way valve performance checking procedures
6.3.1 Class 25/35
Turn power off and then
Start heating operation.
Disconnect four way valve coil
from connector and check the
valve coil resistance at
Replace four way valve.
1 - 6
3 - 6
C h e k c
2 - 5
4 - 5
5 6
(R106366)
on again.
*Four way valve coil
Heating: Energized
S80 voltage at
No
180-280V with
compressor on?
*Refer Figure 1 below.
Yes
continuity.
Four way
No
Yes
(Fig. 1)
Voltage at S80
DC180-280V
DC12-15V
Harness 5P
(5)
6P Connector
S 2 0
1 2 3 4 5 6
Not Energized
Replace outdoor PCB.
Replace four way valve coil.
Compressor
ON Time
Refrigerant Diagram
1 - 6
3 - 6
C h e k c
2 - 6
4 - 6
(R106366)
74