93 High

Evo 93 Fault Code

The Evo 93 fault code means: your boiler is struggling to detect the flame it has lit, causing the system to shut down for safety.. It appears on 1 Evo 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: H......F..... (FLAME DETECTION ERROR)
Typical repair cost £100-£280 (including labour)

DIY fix possible

Check that your gas emergency control valve is open and you have credit on your gas meterTest if other gas appliances in the home, such as a hob, are working correctlyPress the reset button once to see if the boiler restarts

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Evo models that show the 93 fault code

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

Source

Evo 93 fault code information on this page is sourced and cross-checked against the official Evo service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026