H29
Panasonic Bypass Valve / Flow Control Error

Panasonic water heater shows H29; may be related to abnormal water flow or bypass valve issues.

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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

Stuck bypass valve, Scale buildup in water path, Faulty flow control motor, Defective PCB control output

How to Fix / Troubleshooting

Burn and leak hazard: Turn OFF power and close water valves before opening water connections.

  • 1. Check water flow: Ensure adequate inlet pressure and clean inlet filter, aerators, and shower heads.
  • 2. Descale water path: Perform a descaling procedure on the heat exchanger and internal water circuit.
  • 3. Inspect bypass valve (qualified persons):
    • Remove the front cover.
    • Locate the bypass or flow control valve and its motor.
    • Check wiring and connector for secure fit.
  • 4. If valve is stuck: The bypass valve assembly may need replacement by an authorized technician.
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Repair Difficulty

Hard 4/5

Required Part

Bypass / Flow Control Valve Assembly
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