How much does it cost to fix Potterton error code Error 119?

Typical repair cost for the Potterton Error 119 fault is £80-150 including labour.

Error 119 High

Potterton Error 119 Fault Code

Q: What does the Potterton Error 119 fault code mean?

Your boiler has stopped working because the water pressure inside your heating system has dropped too low.

Also written as ERROR119 — same fault.

The Potterton Error 119 fault code means: your boiler has stopped working because the water pressure inside your heating system has dropped too low.. It appears on 2 Potterton models in our database.

Technical description: CH system pressure less than 0.5 bar / Water pressure switch

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, usually a small silver braided hose with one or two valves located underneath the boiler.Gradually open the valve(s) to allow water into the system while watching the pressure gauge on the front panel.Stop filling exactly when the needle reaches the green zone, typically between 1.0 and 1.5 bar, and ensure the valve is tightly closed.

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Potterton models that show the Error 119 fault code

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

Source

Potterton Error 119 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

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