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16.5.34 Refrigeration Cycle Abnormality (F24)
Malfunction Decision Conditions:
1 During operation of cooling and heating, compressor frequency > Frated.
2 During operation of cooling and heating, running current: 0.65 A < I < 1.65 A.
3 During operation of cooling, water inlet temperature - indoor refrigerant liquid temperature < 5°C.
4 During operation of heating, indoor refrigerant liquid temperature - water inlet temperature < 5°C.
Malfunction Caused:
1 Faulty water inlet or indoor refrigerant liquid temperature sensors.
2 2/3 way valve closed.
3 Refrigerant shortage (refrigerant leakage).
4 Clogged expansion valve or strainer.
5 Faulty outdoor unit PCB (main).
6 Poor compression of compressor.
Abnormality Judgment:
Continue 2 times in 20 minutes.
Is the 2/3 way valve closed?
No
Check the water inlet and indoor
ref. liquid temperature sensors.
Replace the water inlet or indoor
ref. liquid temperature sensor.
No
Does it conform to the
sensor characteristic chart?
Yes
Yes
No
Open the 2/3 way valve.
Yes
Check for gas leakage.
Is the oil oozing out from
the 2/3 way valve?
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
- Replace expansion valve
and/or strainer
- Reclaim and recharge
refrigerant
Yes
No
Reclaim and recharge for a
specified amount of fresh refrigerant.
- Replace the outdoor unit
PCB (main)
- Replace the compressor
Yes
No
Is abnormality happened
again?
Procedure complete
Check the 2/3 way valve.
- Repair the pipe flare or
union nuts
- Reclaim and recharge
refrigerant
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution