No lights on High

Alpha No lights on Fault Code

Also written as NOLIGHTSON — same fault.

The Alpha No lights on fault code means: your boiler has lost all power and the control panel is completely blank, meaning it cannot operate at all.. It appears on 1 Alpha model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Electricity fault
Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if other appliances in your home are working to rule out a general power cutCheck your main consumer unit (fuse box) to see if the heating circuit breaker has trippedEnsure the fused spur switch next to the boiler is turned on and check the 3-amp fuse inside it

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Alpha models that show the No lights on fault code

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

Source

Alpha No lights on fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.

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