How much does it cost to fix Ideal error code 87 H.....4....?

Typical repair cost for the Ideal 87 H.....4.... fault is £150-250 including labour.

87 H.....4.... High

Ideal 87 H.....4.... Fault Code

Q: What does the Ideal 87 H.....4.... fault code mean?

Your boiler has detected that it is not sensing water correctly within the system, causing it to stop running to prevent potential damage.

Also written as 87H4 — same fault.

The Ideal 87 H.....4.... fault code means: your boiler has detected that it is not sensing water correctly within the system, causing it to stop running to prevent potential damage.. It appears on 2 Ideal models in our database.

Technical description: DRY FIRE THERMISTOR ERROR

Typical repair cost £150-250 (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 87 H.....4.... fault code

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

Source

Ideal 87 H.....4.... 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