How much does it cost to fix Potterton error code Pressure below 1?

Typical repair cost for the Potterton Pressure below 1 fault is £80-150 including labour.

Pressure below 1 High

Potterton Pressure below 1 Fault Code

Q: What does the Potterton Pressure below 1 fault code mean?

Your boiler has lost the water pressure needed to circulate heating around your home, likely due to a minor leak or trapped air.

Also written as PRESSUREBELOW1 — same fault.

The Potterton Pressure below 1 fault code means: your boiler has lost the water pressure needed to circulate heating around your home, likely due to a minor leak or trapped air.. It appears on 1 Potterton model in our database.

Technical description: May indicate a leak on the central heating system.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, which is a silver flexible braided hose usually found under the boiler.Open the valves at both ends of the hose to allow water into the system while watching the pressure gauge.Close both valves once the needle reaches the green zone, typically between 1.0 and 1.5 bar.

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Potterton models that show the Pressure below 1 fault code

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

Performa System HE Repair: £80-150

Source

Potterton Pressure below 1 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