Medium
S.54 on Vaillant Turbomax Plus VUW 242E

Your boiler has temporarily entered a cooling-down pause because the water inside is heating up too quickly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Delay mode due to flow temperature gradient too steep (approx 10 mins.)

DIY fix possible

Check that at least two or three radiator valves are fully openEnsure the system pressure is between 1.0 and 1.5 bar on the gaugeBleed all radiators to remove trapped airPress the reset button if the boiler does not automatically restart after 10 minutes

Find a Gas Safe engineer
Search the official register →

Related fault codes

S.53View →F.22View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Radiators cold at the bottom

Sludge build-up — needs flushing, not bleeding.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →