What does the Potterton neon flashing (Section C) fault code mean?

Your boiler is struggling to detect water moving through its system, which prevents it from firing safely.

How much does it cost to fix Potterton error code neon flashing (Section C)?

Typical repair cost for the Potterton neon flashing (Section C) fault is £150-250 including labour.

Primary flow switch operated - CH system pressure 0.5 to 1.5 bar, automatic air vent open, or primary flow valve diaphragm damaged.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Almost always a stuck diverter valve on combis.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.