Low
283 on Worcester Bosch Junior 28i

Your boiler is currently going through its normal startup sequence and is getting ready to light the burner.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

The boiler is preparing for a burner start – the fan and pump are activated

DIY fix possible

Wait for up to 2 minutes for the boiler to finish its startup checkEnsure your thermostat is calling for heatCheck that the gas supply is turned on if the boiler fails to light after this code

Find a Gas Safe engineer
Search the official register →

Related fault codes

284View →C6View →

Related guides you might find useful

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

New boiler cost 2026

Realistic UK prices for a swap.

Read →