Bosch Gas Leak / Combustion Gas Leakage

Bosch gas water heater produces a strong gas smell near the 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

Loose gas connection at heater, Cracked gas valve body, Leaking gas union or flex connector, Incomplete combustion with flue gas spillage

How to Fix / Troubleshooting

Safety first: If you smell gas strongly, do not operate electrical switches or create sparks. Evacuate the area, shut off the gas at the main if safe to do so, and contact your gas supplier or emergency services.

  • Do not attempt DIY gas repairs: Gas leaks must be located and repaired by a licensed gas fitter using proper leak detection equipment.
  • Ventilate: Open windows and doors to disperse gas if it is safe.
  • Tag out heater: Leave the heater off and tagged until a professional has inspected and pressure-tested all gas connections and components.
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Repair Difficulty

Professional Required 5/5

Required Part

Gas Valve Assembly
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