How much does it cost to fix Ideal error code 89 H......n.....?

Typical repair cost for the Ideal 89 H......n..... fault is £90-160 including labour.

89 H......n..... High

Ideal 89 H......n..... Fault Code

Q: What does the Ideal 89 H......n..... fault code mean?

Your boiler is failing to start because the electrical supply wires—specifically the live and neutral—have been connected the wrong way around.

Also written as 89HN — same fault.

The Ideal 89 H......n..... fault code means: your boiler is failing to start because the electrical supply wires—specifically the live and neutral—have been connected the wrong way around.. It appears on 2 Ideal models in our database.

Technical description: PHASE REVERSAL ERROR

Typical repair cost £90-160 (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 89 H......n..... fault code

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

Source

Ideal 89 H......n..... 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