How much does it cost to fix Johnson Starley error code 57?

Typical repair cost for the Johnson Starley 57 fault is £90-180 including labour.

57 High

Johnson Starley 57 Fault Code

Q: What does the Johnson Starley 57 fault code mean?

Your heater is getting too hot because the air cannot flow through the system properly, causing it to shut down for safety.

The Johnson Starley 57 fault code means: your heater is getting too hot because the air cannot flow through the system properly, causing it to shut down for safety.. It appears on 4 Johnson Starley models in our database.

Technical description: High warm air temperature (Lt displayed on screen)

Typical repair cost £90-180 (including labour)

DIY fix possible

Check all warm air vents throughout the house are fully open and not obstructed by furniture or curtainsInspect the air filter and clean or replace it if it is clogged with dustEnsure the return air grille is clear of any blockages

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Johnson Starley models that show the 57 fault code

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

Source

Johnson Starley 57 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