Pr 29 Medium

Biasi Pr 29 Fault Code

Also written as PR29 — same fault.

The Biasi Pr 29 fault code means: your boiler has detected an issue with the sensor that monitors the temperature of the cold water coming into the unit, which can affect its ability to heat your water correctly.. It appears on 1 Biasi model 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: Presence of domestic cold water temp. probe or set of inlet cold water with solar control
Typical repair cost £90-160 (including labour)

Engineer required

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

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Biasi models that show the Pr 29 fault code

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

Source

Biasi Pr 29 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

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