Heater displays H06 and does not start; sometimes occurs intermittently when opening taps.

Safety: Turn OFF power before removing the front cover. Avoid pulling on wires directly.

• 1. Reset the unit: Turn OFF power for 2–3 minutes, then restore and test. If H06 reappears, continue.
• 2. Access inlet thermistor (qualified persons):
  • Remove the front panel.
  • Locate the inlet water pipe; the thermistor is usually clipped or threaded into this pipe.
  • Identify the small two‑wire connector from the thermistor to the PCB.
• 3. Inspect wiring:
  • Check for broken insulation, pinched wires, or loose connectors.
  • Reseat the connector on the PCB and at the sensor.
• 4. Check for corrosion or water ingress:
  • If the thermistor body shows corrosion or signs of leakage, it should be replaced.
• 5. Replace inlet thermistor: If wiring is intact but H06 persists, replace the inlet water temperature sensor with a Panasonic‑specified part. Clear the code by power cycling.
• 6. If still unresolved: The main control PCB may have a failed sensor input and should be tested by an authorized technician.