Medium
S.54 on Vaillant Turbomax Plus 828 E

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

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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 all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 barBleed any air from radiatorsWait 10-15 minutes for the delay timer to reset automatically

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Related fault codes

S.53View →F.22View →

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