How much does it cost to fix Heatline error code Low water pressure?

Typical repair cost for the Heatline Low water pressure fault is £80-150 including labour.

Low water pressure High

Heatline Low water pressure Fault Code

Q: What does the Heatline Low water pressure fault code mean?

Your boiler has switched itself off because the water level inside the heating system has dropped too low to operate safely.

Also written as LOWWATERPRESSURE — same fault.

The Heatline Low water pressure fault code means: your boiler has switched itself off because the water level inside the heating system has dropped too low to operate safely.. It appears on 2 Heatline models in our database.

Technical description: Bar LED Flashing. Boiler monitors water pressure or water shortage in the primary hydraulic circuit and will switch the boiler off if the pressure is below 0.3bar.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, which is usually a silver braided hose under the boiler.Open the small valve or tap attached to the loop slowly, allowing water to enter the system while watching the pressure gauge.Stop filling once the needle reaches the green zone, typically between 1.0 and 1.5 bar, then ensure the valve is fully closed.

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Heatline models that show the Low water pressure fault code

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

Source

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

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