Low Information
c80 on Potterton Powermax HE

Your boiler is currently showing its water temperature and is likely waiting for you to check the system pressure before it resumes normal operation.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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 flow temperature to CH. O.K. Scroll to pressure display "P". Press RESET button to scroll display

What causes this fault?

This code appears when the boiler's internal sensor detects that the water temperature has reached a certain level and is now waiting for user confirmation of the system pressure. It often occurs after a period of heavy use or if the system has recently been refilled, requiring you to manually toggle the display to ensure there is enough water in the unit. The boiler effectively pauses until it is sure the pressure is within the safe operating range.

DIY fix possible

Press the 'Scroll' button to view the pressure display 'P'Check that the pressure is between 1.0 and 1.5 barPress the 'Reset' button to clear the display and return to normal operation

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →