1 2 OUTDOOR SENSOR ERROR Low

Johnson Starley 1 2 OUTDOOR SENSOR ERROR Fault Code

Also written as 12OUTDOORSENSORERROR — same fault.

The Johnson Starley 1 2 OUTDOOR SENSOR ERROR fault code means: your boiler is having trouble reading the temperature outside, which means it might not adjust your heating correctly as the weather changes.. It appears on 1 Johnson Starley model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Outdoor sensor error
Typical repair cost £90-160 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Johnson Starley models that show the 1 2 OUTDOOR SENSOR ERROR fault code

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

Source

Johnson Starley 1 2 OUTDOOR SENSOR ERROR fault code information on this page is sourced and cross-checked against the official Johnson Starley service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026