How much does it cost to fix Ariston error code Limescale Build-up?

Typical repair cost for the Ariston Limescale Build-up fault is £150-300 including labour.

Limescale Build-up Medium

Ariston Limescale Build-up Fault Code

Q: What does the Ariston Limescale Build-up fault code mean?

Your boiler has detected that limescale is building up inside the part that heats your tap water, so it is limiting its own temperature to protect itself from further damage.

Also written as LIMESCALEBUILDUP — same fault.

The Ariston Limescale Build-up fault code means: your boiler has detected that limescale is building up inside the part that heats your tap water, so it is limiting its own temperature to protect itself from further damage.. It appears on 6 Ariston models in our database.

Technical description: Indirect control (actuated through the regulation of the temperature in the primary heat exchanger) on the formation of limescale in the secondary heat exchanger; temperature is limited to 62°C.

Typical repair cost £150-300 (including labour)

Engineer required

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

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Ariston models that show the Limescale Build-up fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026