BoilerFaultCodesDimplex 3 Fault Code
The Dimplex 3 fault code means: your boiler is failing to light the gas flame or keep it burning, which has caused the system to shut down for safety.. It appears on 1 Dimplex model in our database.
Technical description: No gas or Lockout flame signal / No flame, Lockout after 5 ignition attempts - Low gas pressure. Loss of flame signal during operation
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to ensure your gas supply is on.If you have a prepayment meter, check that you have sufficient credit.Try resetting the boiler by following the instructions in your user manual.
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Dimplex models that show the 3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Dimplex 3 fault code information on this page is sourced and cross-checked against the official Dimplex service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026