87 Medium

Ideal 87 Fault Code

The Ideal 87 fault code means: your boiler is struggling to accurately measure the temperature of your hot water, which may lead to the water being too cold or failing to heat up at all.. It appears on 3 Ideal models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

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 fault code

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

Source

Ideal 87 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 7 July 2026