BoilerFaultCodesIdeal C/H Sensor Fault Fault Code
Also written as CHSENSORFAULT — same fault.
The Ideal C/H Sensor Fault fault code means: your boiler has lost its ability to accurately measure the temperature of the water being heated for your radiators, causing it to stop running as a safety precaution.. It appears on 2 Ideal models in our database.
Technical description: If a fault occurs with the boiler thermostat the fault display screen will show "C/H Sensor Fault".
What causes the Ideal C/H Sensor Fault fault?
This fault occurs when the internal sensor responsible for monitoring your central heating temperature fails to send a reliable signal to the main control board. The most common reason is that the sensor's internal electrical resistance has drifted out of range or the component has suffered a complete electrical failure due to age. In some cases, loose or damaged wiring between the sensor and the controller can also trigger this shutdown.
This fault is more common during the autumn months when the boiler is first switched on after a long summer break, as electrical components can seize or fail after being dormant.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the C/H Sensor Fault fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal C/H Sensor Fault 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