Biasi Delayed Ignition / Hard Light-Off

Water heater ignites with a loud bang or popping noise.

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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

Dirty burner, Incorrect electrode gap, Low gas pressure, Gas valve adjustment issue

How to Fix / Troubleshooting

Safety: Turn off gas and power immediately if ignition is violent or if you smell gas. Do not continue to operate the heater.

Steps:

  • Clean burner: After isolating gas and power, remove the burner and clean off dust, rust, and debris with a soft brush and vacuum.
  • Inspect ignition electrode: Ensure the electrode is not cracked and that the spark gap and position match Biasi specifications.
  • Check flue and air intake: Ensure adequate combustion air by clearing any obstructions.

Important: Gas pressure and valve settings must only be checked and adjusted by a licensed gas technician. Persistent banging requires professional attention.

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Repair Difficulty

Hard 4/5

Required Part

Main Burner Assembly
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