How much does it cost to fix Ideal error code 87 H.....3.....?

Typical repair cost for the Ideal 87 H.....3..... fault is £120-200 including labour.

87 H.....3..... High

Ideal 87 H.....3..... Fault Code

Q: What does the Ideal 87 H.....3..... fault code mean?

Your boiler is struggling to accurately measure the temperature of the water used for your taps and shower, which will likely prevent you from getting hot water.

Also written as 87H3 — same fault.

The Ideal 87 H.....3..... fault code means: your boiler is struggling to accurately measure the temperature of the water used for your taps and shower, which will likely prevent you from getting hot water.. It appears on 1 Ideal model in our database.

Technical description: DHW TEMPERATURE SENSOR

Typical repair cost £120-200 (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.....3..... fault code

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

Isar M30 / M100 Repair: £120-200

Source

Ideal 87 H.....3..... 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