BoilerFaultCodesDimplex 5 Fault Code
The Dimplex 5 fault code means: your boiler has likely overheated or a critical safety sensor has failed, preventing it from running for your safety.. It appears on 2 Dimplex models in our database.
Technical description: Defective sensor or thermal fuse blown - Defective flow, return or flue sensor or heat exchanger reached maximum safe working temperature
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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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 31 August 2026