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13.4.18 F17 (Indoor Standby Units Freezing Abnormality)
Malfunction Decision Conditions
When the different between indoor intake air temperature and indoor pipe temperature is above 10°C or indoor
pipe temperature is below -1.0°C.
Remark:
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor
unit and H39 to other indoor unit(s).
Malfunction Caused
Wrong wiring connection.
Faulty sensor.
Faulty expansion valve.
Troubleshooting
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
When abnormality starts again
Check the indoor pipe temperature
thermistor:
Plug out connector (CN-TH) from the
indoor unit PCB
Replace
Outdoor 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?
The 4-way valve may have been damaged or
wrongly connected between discharge and
suction tube
Problem occurs in heating mode only?
Is 4-way solenaid valve being energised?
Defect in indoor pipe temperature
thermistor
Replace the indoor pipe temperature
thermistor
4-way valve not working
(not energize)
Check CN-HOT
connection
(4-way valve connector)
Check V-coil attach to
solenoid valve
Check valve v-coil
continuity
Measure voltage
supplied to CH-HOT at
the start of heating
YES
OK
No
Good
4 WAYS VALVE
COIL COMPLETE
YELLOW
CN-HOT
(WHT)
1
2
YELLOW
No
Good
No
continuity
(open)
OK
OK
No supply
YES
Outdoor PCB fault
Reserve solenoid valve faulty
Replace Outdoor PCB
Check connecting tubes to 4-way valve
Replace the 4-way valve
Remove CN-HOT.
Measure continuity
of the coil
Reconnect CN-HOT
(4-way valve connector)
Attach and screw the V-coil
to solenoid valve
Replace
V-coil only
V-coil fault
CN-HOT
4 WAYS
VALVE
(VH9-2)
Outdoor PCB fault
YES
NO
NO
NO, it happen in cooling/dry as well
OK (Depending on 4-way valve model)
1 2 3
Caution
