The flame parasite error is a common issue in condensing boilers, an advanced technology used for home heating. This article explores the causes of this error, possible solutions, and how to prevent it, with a particular focus on maintenance and the intervention of a qualified technician.

What is the Flame Parasite Error?

The flame parasite error occurs when the detection spark plug, responsible for detecting the flame, if wet, shorts out with the body of the exchanger. This leads the boiler's board to signal an error, as it mistakenly interprets the situation as an abnormal presence of flame (perhaps with the burner off).

Common Causes

  • Improperly Evacuated Condensation: The most common cause of this error in condensing boilers is the buildup of condensation, which can wet the detection spark plug.
  • Damage to the Spark Plug or Board: In other cases, the problem can be attributed to physical damage or malfunctioning of the detection spark plug or the boiler's electronic board.


  • Intervention of a Qualified Technician: Faced with a flame parasite error, it is essential to request the intervention of a qualified technician. The technician will perform a series of actions:
    • Dry the Detection Spark Plug: Remove moisture from the spark plug to restore its normal functionality.
    • Clean the Condensation Siphon Dirt: Clean the residues and dirt from the siphon to ensure that the condensation is properly evacuated.


  • Regular Maintenance: Regular maintenance by a qualified technician is crucial to prevent the flame parasite error. This maintenance includes cleaning the condensation siphon and checking the detection spark plug.
  • Periodic Checks: It is advisable to carry out periodic checks of the boiler to ensure there are no leaks or moisture accumulations that could compromise the detection spark plug.


Understanding and preventing the flame parasite error is essential for the proper functioning of condensing boilers. Adequate maintenance and timely intervention by qualified technicians are fundamental to ensure the longevity and efficiency of your heating system. With the right maintenance practices and awareness of possible causes, this error can be easily prevented and resolved.