BoilerFaultCodesDimplex 5 Fault Code
The Dimplex 5 fault code means: your boiler has started to heat up but the flame has unexpectedly gone out, causing the system to shut down for safety.. It appears on 3 Dimplex models in our database.
Technical description: Flame loss - Loss of flame signal during operation
DIY fix possible
Check that your gas emergency control valve is open and you have credit on your gas meterCheck if other gas appliances in your home, such as a hob, are working correctlyReset the boiler by following the instructions in your user manual
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Dimplex models that show the 5 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Dimplex 5 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