Panasonic
No Power / Dead Unit
Water heater does not turn on at all; no lights or display on Panasonic unit.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Tripped circuit breaker, Blown internal fuse on PCB, Loose power terminal connections, Faulty main control PCB
How to Fix / Troubleshooting
Electrical hazard: Only qualified persons should work on mains wiring. Always turn OFF the breaker and verify no voltage is present before opening the unit.
- 1. Check external power:
- Verify the dedicated circuit breaker for the heater is ON.
- Test another appliance on the same outlet or circuit if applicable.
- 2. Inspect power cord or wiring:
- Ensure the power cord (if plug‑in type) is fully inserted and not damaged.
- For hard‑wired units, check that the supply wires are firmly secured at the terminal block.
- 3. Check internal fuse (qualified persons):
- Remove the front cover.
- Locate the internal fuse on or near the main PCB.
- If blown, investigate for short circuits before replacing with the exact same rating.
- 4. If unit still dead: The main control PCB or internal power supply is likely faulty and should be replaced by an authorized Panasonic technician.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
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