Four-Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FTXN09KEVJU Service Manual

SiUS041111
5.5

Four-Way Valve Performance Check

Check No.13
5.6

Inverter Unit Refrigerant System Check

Check No.14
Service Diagnosis
Turn off the power and turn it on
again.
Start heating operation.
S80 voltage at
208 - 230 VAC with
compressor on? (Fig.
1)
YES
Disconnect the four-way valve coil
from the connector and check the
continuity.
Four-way valve
coil resistance at 1000 ~
2000 W?
YES
(Fig. 1)
Voltage at S80
208 - 230 VAC
Compressor
ON
Refrigerant system check
Is the discharge pipe
thermistor disconnected
from the holder?
NO
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (U0).
* Four-way valve coil
Cooling / Dry : No continuity
Heating : Continuity
NO
NO
Time
(R14674)
YES
Check
Replace the outdoor unit
PCB.
Replace the four-way valve
coil.
Replace the four-way valve.
(R14673)
Place the thermistor.
Replace the refrigerant.
(R8259)
119