How much does it cost to fix Ideal error code None?

Typical repair cost for the Ideal None fault is £120-200 including labour.

None High

Ideal None Fault Code

Q: What does the Ideal None fault code mean?

Your boiler is struggling to accurately measure the temperature of the water being heated, which is preventing it from running your heating and hot water properly.

Also written as NONE — same fault.

The Ideal None fault code means: your boiler is struggling to accurately measure the temperature of the water being heated, which is preventing it from running your heating and hot water properly.. It appears on 1 Ideal model in our database.

Technical description: Flow Thermistor

Typical repair cost £120-200 (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 None fault code

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

Independent C24 Repair: £120-200

Source

Ideal None 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