A High

Dimplex A Fault Code

The Dimplex A fault code means: your boiler's internal computer has encountered a critical error or is failing to detect a flame, causing the system to stop working for safety.. It appears on 1 Dimplex model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: PCB error / No flame - Internal error
Typical repair cost £280-450 (including labour)

DIY fix possible

Press the reset button once to see if the error clearsCheck that your gas pre-payment meter (if applicable) has creditEnsure other gas appliances in your home, like a hob, are receiving gas

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Dimplex models that show the A fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Dimplex A 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