How much does it cost to fix Halstead error code E18?

Typical repair cost for the Halstead E18 fault is £120-250 including labour.

E18 High

Halstead E18 Fault Code

Q: What does the Halstead E18 fault code mean?

Your boiler has detected that hot water is not flowing through your heating system properly, so it has shut down to prevent overheating.

The Halstead E18 fault code means: your boiler has detected that hot water is not flowing through your heating system properly, so it has shut down to prevent overheating.. It appears on 6 Halstead models in our database.

Technical description: Inadequate circulation (flow/return differential)

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Halstead models that show the E18 fault code

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

Eden Repair: £120-250
Eden 80 Repair: £120-250
Eden CBX/SBX Repair: £120-250
Netaheat 10/16E Repair: £120-250
Wickes 100 Repair: £120-250
Wickes 80 Repair: £120-250

Source

Halstead E18 fault code information on this page is sourced and cross-checked against the official Halstead service / installation manuals for each affected model.

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