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Burst Coil Replacement On A Nilfisk Contractor For A Mobile Fleet Cleaning Company

What they needed

We were called out to inspect a Nilfisk Contractor diesel hot pressure washer used by a company specialising in mobile fleet cleaning. The customer reported that the machine had stopped producing heat and the burner was not operating correctly.

Upon inspection we found the boiler coil had burst inside the boiler jacket, allowing water to leak into the combustion chamber. This had also mixed with unburnt diesel, filling the boiler jacket with contaminated liquid and preventing the burner from operating safely.

Problem / Requirement

  • Machine: Nilfisk Contractor diesel hot pressure washer
  • Main issue: Burst boiler coil inside the burner jacket
  • Boiler condition: Jacket filled with water and unburnt fuel, coil burst and therefore not trapping pressure
  • Burner problem: Burner unable to ignite correctly due to jacket being full of water
  • Operational impact: Machine unable to produce hot water for fleet cleaning operations, or work on cold function

Our Solution

  • Drained the contaminated mixture of water and diesel from the boiler jacket.
  • Removed the damaged boiler coil from the machine.
  • Cleaned the inside of the boiler jacket to remove contaminated fuel and debris.
  • Installed a new replacement boiler coil.
  • Reassembled the burner system
  • Checked burner components including jet and electrodes.
  • Set burner fuel pressure and adjusted air settings for correct combustion.
  • Fully tested the machine to ensure safe operation and proper heat output.

The Result

  • The Nilfisk Contractor is now producing hot water correctly again.
  • The new boiler coil restored proper heat transfer inside the boiler system.
  • The burner is now operating cleanly and reliably after being reset and tuned.
  • The fleet cleaning company can continue using the machine for regular vehicle washdowns without further disruption.

Boiler coil failure is a fairly common issue on diesel hot pressure washers, particularly when machines are used heavily for commercial cleaning. Replacing the coil and correctly resetting the burner ensures the machine runs efficiently and safely again.