167
17.5.18 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:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Is the abnormality happened during
operation of indoor backup heater?
Is measured voltage 230Vac?
Is the CN-OLP1 connector
connection normal?
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
Check indoor backup heater OLP
continuity:
- Turn OFF power supply
- Reset heater 1 OLP
- Measure the continuity of OLP
Is there any continuity?
Check the CN-OLP1 connector connection:
- Turn OFF the power.
- Check the connector connection.
No
No
No
No
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
- Defect in RCCB
- Replace RCCB
- Terminal board assembly
connector poor contact
- Correct the connection or
replace the indoor unit
PCB (main)
- Connector poor contact
- Correct the connection
- Defect in indoor backup
heater OLP
- Replace indoor backup
heater OLP
- Defect in indoor unit
PCB (main)
- Replace the indoor unit
PCB (main)
Yes
Yes
Yes
Yes
Use a test pen to push
this button to reset OLP
Multimeter to
measure continuity
Caution