Low
E430 on Baxi Suprima 50

Your boiler is temporarily checking if there is enough water pressure in the system to operate safely.

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

Water pressure temporary test.

DIY fix possible

Check the pressure gauge on your boiler or central heating systemIf the pressure is below 1.0 bar, use the external filling loop to top it up to 1.5 barEnsure all radiator valves are open and there are no visible leaks

Find a Gas Safe engineer
Search the official register →

Related fault codes

E118View →E119View →E117View →

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

Low pressure — repressurise guide

Step-by-step using the filling loop.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →