Four Way Valve Performance Check; Inverter Unit Refrigerant System Check - Daikin FTXR-T Series Service Manual

SiUS041829E
5.5

Four Way Valve Performance Check

Check No.13
5.6

Inverter Unit Refrigerant System Check

Check No.14
Part 6 Service Diagnosis
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 service diagnosis on
refrigerant shortage (U0).
∗ Four way valve coil
Cooling/Dry/Defrost: Not energized
Heating: energized
NO
NO
Compressor
ON
YES
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.
(R15833)
Check
115