How much does it cost to fix Ariston error code Pressure gauge D < 0.5 bar?

Typical repair cost for the Ariston Pressure gauge D < 0.5 bar fault is £80-150 including labour.

Pressure gauge D < 0.5 bar High

Ariston Pressure gauge D < 0.5 bar Fault Code

Q: What does the Ariston Pressure gauge D < 0.5 bar fault code mean?

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

Q: How much does it cost to fix Ariston error code Pressure gauge D < 0.5 bar?

Typical repair cost for the Ariston Pressure gauge D < 0.5 bar fault is £80-150 including labour.

Q: Can I fix Ariston fault code Pressure gauge D < 0.5 bar myself?

Locate the external filling loop, which is a silver braided hose connecting two pipes beneath the boiler.

Also written as PRESSUREGAUGED05BAR — same fault.

The Ariston Pressure gauge D < 0.5 bar fault code means: your boiler has switched itself off because the water level inside your heating system has dropped too low to operate safely.. It appears on 6 Ariston models in our database.

Technical description: Shutdown due to insufficient water circulation / insufficient pressure of water in the system

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, which is a silver braided hose connecting two pipes beneath the boiler.Open the small valve(s) on the hose until the pressure gauge on the front of the boiler rises to between 1.0 and 1.5 bar.Close the valve(s) tightly to stop the flow of water and ensure the pressure remains steady.

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Ariston models that show the Pressure gauge D < 0.5 bar fault code

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

Source

Ariston Pressure gauge D < 0.5 bar 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