BoilerFaultCodesJohnson Starley 0.86 Fault Code
Also written as 086 — same fault.
The Johnson Starley 0.86 fault code means: your boiler has detected a communication error with its internal temperature sensor, causing it to shut down to prevent incorrect heating operation.. It appears on 1 Johnson Starley model in our database.
Technical description: 72
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 0.86 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Johnson Starley 0.86 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 7 July 2026