BoilerFaultCodesIdeal Outside Sensor Fault Fault Code
Also written as OUTSIDESENSORFAULT — same fault.
The Ideal Outside Sensor Fault fault code means: your boiler is struggling to understand the outdoor temperature, which might make your heating feel less efficient or slightly inconsistent.. It appears on 11 Ideal models in our database.
Technical description: Insecure wiring at boiler/sensor, or incorrect resistance values (31.0-35.0 kΩ at 0°C, 15.0-16.5 kΩ at 15°C, 7.7-8.5 kΩ at 30°C).
What causes the Ideal Outside Sensor Fault fault?
This fault occurs when the boiler loses a reliable electrical signal from the sensor located on your outside wall. The most common reasons are moisture getting into the sensor casing, wires becoming loose or corroded over time, or the internal component failing and sending an incorrect temperature reading.
This fault is more common during autumn and winter, as heavy rain or freezing conditions can accelerate the corrosion of exposed wiring or cause moisture ingress in the sensor.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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Ideal models that show the Outside Sensor Fault fault code
Click a model for the full fault code list and model-specific repair notes.
- Atlantic Combi Repair: £100-200
- Icos System Repair: £120-200
- Logic Code Combi Repair: £90-160
- Logic Code Combi ESP1 Repair: £90-180
- Logic Max Combi Repair: £90-180
- Logic Max Heat Repair: £90-160
- Logic Max Heat 2 Repair: £90-160
- Logic Max System Repair: £90-180
- Logic Max System 2 Repair: £90-180
- Vogue Combi Repair: £120-200
- Vogue System Repair: £120-180
Source
Ideal Outside Sensor Fault fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
- Ideal Atlantic Combi manual (PDF)
- Ideal Icos System manual (PDF)
- Ideal Logic Code Combi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026