Four Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FTX-N Series Service Manual

Check
8.5

Four Way Valve Performance Check

Check No.13
8.6

Inverter Unit Refrigerant System Check

Check No.14
185
Turn off the power. Then, turn on
the power to restart the system.
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 Ω?
YES
(Fig. 1)
Voltage at S80
208 - 230 VAC
Refrigerant system check
Is the discharge pipe
thermistor disconnected from
the holder?
NO
Check for refrigerant leakage.
See the section on refrigerant
shortage detection.
∗ Four way valve coil
Cooling/Dry/Defrost: Not energized
Heating: energized
NO
NO
Compressor
ON
YES
SiUS091601EA
Replace the outdoor unit
PCB (main PCB).
Replace the four way valve
coil.
Replace the four way valve.
(R21936)
Time
(R14674)
Reconnect the thermistor.
Replace the refrigerant.
(R18870)
Part 6 Service Diagnosis