What does the Halstead (No display) fault code mean?

Your boiler has no power and the screen is completely blank, meaning it cannot provide any heating or hot water until electrical flow is restored.

How much does it cost to fix Halstead error code (No display)?

Typical repair cost for the Halstead (No display) fault is £100-£350 including labour.

Check if other appliances or lights in your home are working to rule out a general power cut.

No light indication - Defective power supply

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

Work through these before the call-out.

Almost always a stuck diverter valve on combis.

Safety-critical — turn off, read this.