How much does it cost to fix Ideal error code 50?

Typical repair cost for the Ideal 50 fault is £120-£250 including labour.

50 High

Ideal 50 Fault Code

Q: What does the Ideal 50 fault code mean?

Your boiler is failing to keep its small starter flame lit, which prevents the main heating system from firing up.

The Ideal 50 fault code means: your boiler is failing to keep its small starter flame lit, which prevents the main heating system from firing up.. It appears on 2 Ideal models in our database.

Technical description: PILOT WILL NOT STAY LIT WHEN THE GAS CONTROL VALVE KNOB IS RELEASED

What causes the Ideal 50 fault?

This fault occurs when the boiler's safety mechanism fails to detect a constant flame, causing it to shut off the gas supply for safety. The most common reason is a worn-out sensor called a thermocouple that can no longer signal that the pilot light is safely lit, or a slight blockage in the pilot burner preventing a strong flame. In some cases, it may also be triggered by an internal safety switch that has tripped to prevent the unit from overheating.

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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Ideal models that show the 50 fault code

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

Source

Ideal 50 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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