Panasonic WH-UD07JE5 - Page 212

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19.5.23 Tank Booster Heater OLP Abnormality (H91)
Malfunction Decision Conditions:
During operation of tank booster heater, and tank booster heater OLP open circuit.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty tank booster heater overload protector (OLP).
3 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.
Use a test pen to push
this button to reset OLP
Multimeter to
measure continuity
Is the abnormality happened during
operation of tank booster heater?
- Defect in indoor unit PCB (main).
- Replace the indoor unit PCB (main).
- Connector poor contact.
- Correct the connection.
- Defect in tank booster heater OLP.
- Replace tank booster heater OLP.
- Defect in indoor unit PCB (main).
- Replace the indoor unit PCB (main).
Is the CN-OLP1 connector
connection normal?
Is there any continuity?
No
No
Yes
Check the CN-OLP2 connector connection:
- Turn OFF the power.
- Check the connector connection.
Check tank booster heater OLP continuity:
- Turn OFF power supply.
- Reset tank booster heater OLP.
- Measure the continuity of OLP.
Yes
Yes
Caution