Protherm Combustion or Electrical Overheating Issue

Boiler or flue emits unusual smells (burning, chemical, or exhaust‑like)

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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

Incomplete combustion due to blocked burner or flue, Overheating electrical components on PCB, Dust burning off heat exchanger, Flue gas recirculation into property

How to Fix / Troubleshooting

Critical safety: If you smell gas or exhaust fumes, turn off the boiler, isolate gas, ventilate the area, and contact a qualified technician immediately. Do not ignore combustion smells.

Steps:

  • For mild dust/burning smells on first use of the season, monitor; this may be normal as dust burns off.
  • If smell persists or is strong, a technician must inspect the burner, heat exchanger, and flue for blockages or leaks.
  • Inspect the PCB and wiring for signs of overheating or burning; replace damaged components.
  • Verify flue integrity and correct sealing of the combustion chamber.
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Repair Difficulty

Professional Required 5/5

Required Part

Burner Assembly
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