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15.2.14 F11 (4-Way Valve Switching Abnormality)
Malfunction Decision Conditions
During heating operation, when (liquid pipe temperature – outdoor pipe temperature) is below -5°C.
During cooling operation, when (outdoor pipe temperature – liquid pipe temperature) is below -5°C.
Malfunction Caused
Connector in poor contact.
Faulty
sensor.
Faulty outdoor unit PCB.
Four way valve defective.
Abnormality Judgment:
4 times happen within 30 minutes.
Troubleshooting
Is F11 occur during
heating operation?
Is the four way valve coil
energize during cooling
operation?
No
Check the liquid pipe and outdoor
pipe temperature sensors.
Replace the liquid pipe and
outdoor pipe temperature sensor.
No
Does it conform to the
sensor characteristic chart?
Yes
Four way valve coil
disconnected (loose)?
Reconnect the harness.
Yes
Harness out of connector?
No
Replace the outdoor unit
PCB.
Yes
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Correct the four way
valve coil.
Yes
Check the continuity of
the four way valve coil.
Replace the four way
valve coil.
No
Disconnect the harness from the
connector. Valve coil winding
resistance no open circuit?
No
Measure AC voltage supplied
during heating operation.
Is the voltage supply to four
way valve 220-230Vac?
Replace the outdoor unit
PCB.
Replace the four way
valve.
Replace the four way
valve.
No
Yes
Yes
No
1
CN-HOT
(VH3-2)
4 WAYS
VALVE
2 3
Caution
Содержание CU-5E36QBU-5
Страница 26: ...26 3 Dimensions ...
Страница 27: ...27 4 Refrigeration Cycle Diagram ...
Страница 28: ...28 5 Block Diagram ...
Страница 30: ...30 7 Electronic Circuit Diagram ...
Страница 31: ...31 8 Printed Circuit Board 8 1 Main Printed Circuit Board ...
Страница 32: ...32 8 2 Noise Filter Printed Circuit Board 8 3 Display Printed Circuit Board ...
Страница 33: ...33 9 Installation Information 9 1 Check Points ...
Страница 50: ...50 ...
Страница 51: ...51 ...