BoilerFaultCodesDimplex (No display) Fault Code
Also written as NODISPLAY — same fault.
The Dimplex (No display) fault code means: your boiler appears to have no power and is completely unresponsive, meaning it cannot provide heating or hot water.. It appears on 2 Dimplex models in our database.
Technical description: No lightindication: Defective powersupply
DIY fix possible
Check if other appliances in the house are working to rule out a general power cutCheck your home's main electrical consumer unit (fuse box) to see if a circuit has trippedEnsure the boiler's isolation switch (usually a fused spur near the boiler) is turned onReplace the fuse in the boiler's external fused spur switch with a 3-amp fuse
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Dimplex models that show the (No display) fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Dimplex (No display) 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