What does the Glow-worm d.11 fault code mean?

Your boiler is signalling that the pump responsible for moving water through your heating system is not responding correctly.

How much does it cost to fix Glow-worm error code d.11?

Typical repair cost for the Glow-worm d.11 fault is £180-350 including labour.

Manufacturer manual

Status of the heating circuit's shunt pump

From this model's manual

Verified against the Glow Worm/Glow Worm Flexicom 24c 28c installation & service manual, page 44.

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

Boiler cover options

A cover plan would handle faults like d.11: no call-out fees, no surprise bills.

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Seeing a different code? Every code this model can display, in one place.

Each noise points to a different fault.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.