FR High

Unical FR Fault Code

The Unical FR fault code means: your boiler has stopped working because it has detected that the main part responsible for heating your water is failing to transfer heat correctly.. It appears on 1 Unical model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Heat exchanger
Typical repair cost £400-£1,200 (including labour)

Engineer required

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

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Unical models that show the FR fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026