Panasonic WH-ADC0309H3E Service Manual page 183

17.5.34 Refrigeration Cycle Abnormality (F24) (WH-UD03HE5-1 and WH-UD05HE5-1)
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 < 4°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.
Troubleshooting:
Check the water inlet and indoor
ref. liquid temperature sensors.
Does it conform to the
sensor characteristic chart?
Yes
Check the 2/3 way valve.
Is the 2/3 way valve closed?
No
Check for gas leakage.
Is the oil oozing out from the
2/3 way valve?
No
No
Replace the water inlet or indoor
ref. liquid temperature sensor.
Yes
Open the 2/3 way valve.
- Repair the pipe flare or
Yes
union nuts.
- Reclaim and recharge
refrigerant.
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
No
Reclaim and recharge for a
specified amount of fresh refrigerant.
Is abnormality happened
again?
No
183
- Repair expansion valve
Yes
and/or strainer.
- Reclaim and recharge
refrigerant.
- Replace the outdoor unit
Yes
PCB (main).
- Replace the compressor.
Procedure complete.