Section C Fault Medium

Potterton Section C Fault Fault Code

Also written as SECTIONCFAULT — same fault.

The Potterton Section C Fault fault code means: your boiler is struggling to detect consistent water circulation because trapped air is interfering with its internal sensors.. It appears on 1 Potterton model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: CH system pressure 0.5 to 1.5 bar. Check automatic air vent.
Typical repair cost £90-180 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler to ensure it is reading between 1.0 and 1.5 bar.Bleed all radiators in the house starting from the ground floor and moving upwards to release trapped air.Top up the system pressure to 1.5 bar using the filling loop if the pressure dropped while bleeding radiators.

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Potterton models that show the Section C Fault fault code

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

Source

Potterton Section C Fault 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