b52 Low

Potterton b52 Fault Code

Also written as B52 — same fault.

The Potterton b52 fault code means: your boiler is currently reheating the hot water cylinder and this message is a status update rather than a critical failure.. It appears on 1 Potterton model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Indicative cylinder temperature. O.K. Cylinder being re-heated. Press RESET button to scroll display

What causes the Potterton b52 fault?

This message appears when the boiler's internal sensors detect that the hot water stored in the cylinder has dropped below the target temperature. It indicates that the burner has successfully fired up specifically to boost the water temperature back to your desired setting. It is a normal part of the boiler's operation and shows the system is working as intended to ensure you have hot water available.

DIY fix possible

Wait for the boiler to finish the reheating cyclePress the RESET button to scroll through the display and clear the messageCheck that your hot water timer is set to an 'on' period

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Potterton models that show the b52 fault code

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

Source

Potterton b52 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