How much does it cost to fix Ideal error code E 30?

Typical repair cost for the Ideal E 30 fault is £150-300 including labour.

E 30 High

Ideal E 30 Fault Code

Q: What does the Ideal E 30 fault code mean?

Your boiler is struggling because it cannot move the hot water away from the heating unit quickly enough, leading to a significant temperature difference between the outgoing and returning water.

Also written as E30 — same fault.

The Ideal E 30 fault code means: your boiler is struggling because it cannot move the hot water away from the heating unit quickly enough, leading to a significant temperature difference between the outgoing and returning water.. It appears on 1 Ideal model in our database.

Technical description: Flow/return temperature differential too high

Typical repair cost £150-300 (including labour)

Engineer required

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

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Ideal models that show the E 30 fault code

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

Imax W Repair: £150-300

Source

Ideal E 30 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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