BoilerFaultCodesIdeal 24 Fault Code
The Ideal 24 fault code means: your boiler has lost communication with one of its internal sensors, meaning it cannot accurately monitor temperatures to run safely.. It appears on 3 Ideal models in our database.
Technical description: Sensor defect or improper contacts and connections.
What causes the Ideal 24 fault?
This fault occurs when the boiler's control board can no longer read the temperature signals from the internal sensors. The most common reason is a physical failure of the thermistor component itself, or loose wiring connections caused by the natural vibrations of the boiler over time.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the 24 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 24 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