How much does it cost to fix Ideal error code pressure difference < 0.9 mbar?

Typical repair cost for the Ideal pressure difference < 0.9 mbar fault is £120-280 including labour.

pressure difference < 0.9 mbar High

Ideal pressure difference < 0.9 mbar Fault Code

Q: What does the Ideal pressure difference < 0.9 mbar fault code mean?

Your boiler is unable to safely clear exhaust gases, which is preventing it from firing up to provide heating or hot water.

Q: How much does it cost to fix Ideal error code pressure difference < 0.9 mbar?

Typical repair cost for the Ideal pressure difference < 0.9 mbar fault is £120-280 including labour.

Also written as PRESSUREDIFFERENCE09MBAR — same fault.

The Ideal pressure difference < 0.9 mbar fault code means: your boiler is unable to safely clear exhaust gases, which is preventing it from firing up to provide heating or hot water.. It appears on 1 Ideal model in our database.

Technical description: Pressure difference at switch is not greater than 0.9 mbar; check fan, pressure switch sensing pipes for blockages, bad or reversed connections.

Typical repair cost £120-280 (including labour)

Engineer required

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

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Ideal models that show the pressure difference < 0.9 mbar fault code

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

Classic NF Repair: £120-280

Source

Ideal pressure difference < 0.9 mbar fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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