How much does it cost to fix Sime error code 80?

Typical repair cost for the Sime 80 fault is £120-250 including labour.

80 High

Sime 80 Fault Code

Q: What does the Sime 80 fault code mean?

Your boiler is not firing because it has failed to ignite the flame during the start-up sequence.

The Sime 80 fault code means: your boiler is not firing because it has failed to ignite the flame during the start-up sequence.. It appears on 1 Sime model in our database.

Technical description: 5 Ø eldnips remmirT

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Sime models that show the 80 fault code

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

Dewy 30/130 HE FS Repair: £120-250

Source

Sime 80 fault code information on this page is sourced and cross-checked against the official Sime service / installation manuals for each affected model.

Sime Dewy 30/130 HE FS manual (PDF)

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