Panasonic water heater stops shortly after starting; display shows H02 and water remains cold.

Safety warning: Turn OFF power and close the gas valve before removing covers. If you are not comfortable working with gas appliances, contact a licensed technician.

• 1. Confirm gas supply stability:
  • Check that other gas appliances run without flickering or going out.
  • If multiple appliances cause pressure drop, avoid running them all at once or consult your gas supplier.
• 2. Inspect venting:
  • Ensure the exhaust flue is not partially blocked and that the terminal is clear.
  • Check for signs of condensation dripping back into the heater, which can disturb the flame.
• 3. Clean burner and flame rod (qualified persons):
  • Remove the front panel.
  • Access the burner assembly; vacuum dust and debris from the burner surface.
  • Clean the flame rod with fine abrasive pad to remove scale or soot.
• 4. Check flame rod wiring:
  • Inspect the cable from the flame rod to the control PCB for damage or loose connectors.
  • Reseat connectors firmly.
• 5. If H02 recurs frequently: The gas control valve or main PCB may be failing and should be tested and replaced by an authorized Panasonic technician.