How much does it cost to fix Myson error code 10.3?

Typical repair cost for the Myson 10.3 fault is £120-250 including labour.

10.3 High

Myson 10.3 Fault Code

Q: What does the Myson 10.3 fault code mean?

Your boiler has a flame for the pilot light, but the main heating burner is failing to ignite, meaning you won't have any heating or hot water.

Also written as 103 — same fault.

The Myson 10.3 fault code means: your boiler has a flame for the pilot light, but the main heating burner is failing to ignite, meaning you won't have any heating or hot water.. It appears on 2 Myson models in our database.

Technical description: Pilot lit, main burner will not light

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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Myson models that show the 10.3 fault code

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

Economist WM Repair: £120-250
Economist WM Series Repair: £120-250

Source

Myson 10.3 fault code information on this page is sourced and cross-checked against the official Myson service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026