H15
Panasonic Power Supply / Low Voltage Error

Panasonic water heater shows H15; may be associated with power supply issues or internal low‑voltage faults.

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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

Incorrect supply voltage, Loose power terminal connections, Internal power supply failure on PCB, Undersized wiring causing voltage drop

How to Fix / Troubleshooting

Electrical hazard: Only qualified persons should work on mains wiring. Turn OFF the breaker and verify absence of voltage before opening the electrical compartment.

  • 1. Verify supply voltage:
    • Check that the heater is connected to the correct voltage as specified on the rating plate.
    • Use a multimeter (qualified persons) to confirm stable voltage at the input terminals.
  • 2. Inspect power terminals:
    • Ensure all screws at the power terminal block are tight.
    • Look for signs of overheating or discoloration.
  • 3. Check circuit breaker and wiring size:
    • Confirm the breaker rating and cable size meet Panasonic installation requirements.
  • 4. If H15 persists with correct supply: The internal power supply section of the PCB may be faulty and the PCB should be replaced by an authorized technician.
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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