h High

Dimplex h Fault Code

Also written as H — same fault.

The Dimplex h fault code means: your boiler is failing to light the gas flame properly because internal wiring or a connection has become loose or damaged.. 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: No flame - Faulty connector
Typical repair cost £90-180 (including labour)

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 h fault code

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

Source

Dimplex h 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