High
BLANK DISPLAY SCREEN on Grant Spira

Your boiler has lost all power and is completely unresponsive, meaning it cannot provide any heating or hot water until the electrical connection or internal safety switch is restored.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Boiler will not fire – blank screen. This can be caused by the electrical supply being switched off, a tripped overheat stat, a tripped pellet feed tube stat, the combustion chamber door being open, or a faulty ribbon cable/PCB.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

No hot water but heating works

Almost always a stuck diverter valve on combis.

Read →

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →