F11

Malfunction Decision Conditions

  • When indoor heat exchanger is cold during heating (except deice) or when indoor heat exchanger is hot during cooling and compressor operating, the 4-way valve is detected as malfunction.

Malfunction Caused

  • Indoor heat exchanger (pipe) thermistor
  • 4-way valve malfunction

Troubleshooting

When abnormality starts again
↓
⚠
Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
Check the indoor pipe temperature thermistor:
• Plug out connector (CN-TH) from the indoor unit PCB
• Measure the resistance of the indoor heat exchanger temperature thermistor
↓
Is the measured resistance of the indoor pipe temperature thermistor matches the value specified in its characteristic chart?
NO
→
NO↓
  • Defect in indoor pipe temperature thermistor
  • Replace the indoor pipe temperature thermistor
YES
↓
Problem occurs in heating mode only?
YES
→
If YES (Heating mode only)
4-way valve not working
(not energize)
4 WAYS VALVE
---- YELLOW ---- [ CN-HOT ]
---- YELLOW ---- [ (WHT) ]
COIL COMPLETE
NO, it happen in cooling/dry as well
↓
If NO (happens in cooling/dry as well)
Is 4-way solenoid valve being energised?
YES
→
YES↓
Outdoor PCB fault
  • Replace Outdoor PCB
NO
↓
The 4-way valve may have been damaged or wrongly connected between discharge and suction tube
• Check connecting tubes to 4-way valve
↓
Check CN-HOT connection
(4-way valve connector)
No
Good
→
No Good↓
  • Reconnect CN-HOT
    (4-way valve connector)
OK
↓
Check V-coil attach to solenoid valve
No
Good
→
No Good↓
  • Attach and screw the V-coil to solenoid valve
OK
↓
Check valve v-coil continuity
No
continuity
(open)
→
No continuity (open)↓
V-coil fault
  • Replace V-coil only
[ Multimeter ]
↓
( Measure V-Coil )
↓
OK
Remove CN-HOT.
Measure continuity
of the coil
Measure voltage supplied to CH-HOT at the start of heating
OK (Depending on 4-way valve model)
→
OK (Depending on 4-way valve model)↓
Reverse solenoid valve faulty
  • Replace the 4-way valve
No supply
↓
Outdoor PCB fault
  • Replace Outdoor PCB
* Check gas side pipe – for hot gas flow in cooling mode
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