How much does it cost to fix Potterton error code On Off * *?

Typical repair cost for the Potterton On Off * * fault is £80-150 including labour.

On Off * * High

Potterton On Off * * Fault Code

Q: What does the Potterton On Off * * fault code mean?

Your boiler has stopped working because the pipe that drains away waste water is blocked, causing the system to temporarily shut down to prevent internal damage.

Also written as ONOFF — same fault.

The Potterton On Off * * fault code means: your boiler has stopped working because the pipe that drains away waste water is blocked, causing the system to temporarily shut down to prevent internal damage.. It appears on 2 Potterton models in our database.

Technical description: Condensate pump over level switch activated - reservoir level too high resulting in ignition lockout.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the plastic condensate pipe exiting your boiler or property near the exterior wall.Check the end of the pipe outside for blockages like ice, leaves, or debris.If the pipe is frozen, pour warm (not boiling) water over the frozen section to thaw it out.Reset your boiler using the reset button on the control panel.

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Potterton models that show the On Off * * fault code

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

Source

Potterton On Off * * 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