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

Typical repair cost for the Ideal Overheat fault is £90-220 including labour.

Overheat High

Ideal Overheat Fault Code

Q: What does the Ideal Overheat fault code mean?

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

Also written as OVERHEAT — same fault.

The Ideal Overheat fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 3 Ideal models in our database.

Technical description: Overheat thermostat fault detected by diagnostic feature.

What causes the Ideal Overheat fault?

This fault occurs when the water inside the boiler exceeds a safe temperature limit, triggering a safety sensor to cut the power. The most common reasons are a failed pump that isn't moving water away fast enough or a blockage in the heat exchanger that traps heat. Sometimes, it can also be caused by a build-up of air or sludge in the system restricting flow.

This fault is more common when the heating is first turned on after summer, as pump components can seize up during long periods of inactivity.

Typical repair cost £90-220 (including labour)

DIY fix possible

Check that your radiator valves are open to allow water to flowEnsure the system pressure is within the normal range (usually 1 to 1.5 bar)Locate the manual reset button on the control box and press it firmly

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Ideal models that show the Overheat fault code

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

Source

Ideal Overheat 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