Panasonic WH-SXC09H3E8 Service Manual page 182

16.5.18 Indoor Backup Heater OLP Abnormality (H70)
Malfunction Decision Conditions:
During operation of indoor backup heater, when no power supplies to indoor backup heater or OLP open circuit.
Malfunction Caused:
1 Faulty power supply connector connection.
2 Faulty connector connection.
3 Faulty indoor backup heater overload protector (OLP).
4 Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 60 seconds.
Troubleshooting:
Is the abnormality happened during
operation of indoor backup heater?
Yes
Check the indoor backup heater incoming
AC power supply (2):
- Turn ON power supply (2) & RCCB
- Measure the AC voltage between RCCB's
L1 & N1
- Measure the AC voltage between PCB's
AC2-L3 & AC2-N2
Is measured voltage 230Vac?
Yes
Check the CN-OLP1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-OLP1 connector
connection normal?
Yes
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
- Defect in RCCB
- Replace RCCB
- Terminal board assembly
No
connector poor contact
- Correct the connection or
replace the indoor unit
PCB (main)
No
- Connector poor contact
- Correct the connection
Check indoor backup heater OLP
continuity:
- Turn OFF power supply
- Reset heater 1 OLP
- Measure the continuity of OLP
Is there any continuity?
182
Use a test pen to push Use a test pen to push
this button to reset OLP this button to reset OLP
Multimeter to Multimeter to
measure continuity measure continuity
- Defect in indoor backup
No
heater OLP
- Replace indoor backup
heater OLP
- Defect in indoor unit
Yes
PCB (main)
- Replace the indoor unit
PCB (main)