Buderus Short Cycling on Flame Loss

Furnace starts then shuts off after a few seconds, no error code displayed

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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 flame sensor, Poor grounding of burner, Unstable gas pressure, Partially blocked burner

How to Fix / Troubleshooting

Safety: Turn off power and gas before opening the burner compartment.

Steps:

  • Clean flame sensor: Remove and gently clean the Buderus flame rod with fine steel wool. Reinstall securely.
  • Check burner ground: Ensure the burner assembly has a solid metal-to-metal connection to the furnace chassis. Tighten mounting screws and clean rust.
  • Inspect burner: Look for rust flakes or debris on the burner head. Clean with a soft brush and vacuum.
  • Monitor gas supply: If other gas appliances flicker or drop out, contact your gas supplier.

If short cycling continues, a technician should check combustion and gas valve operation.

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Repair Difficulty

Hard 4/5

Required Part

Flame Sensor Rod
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