What does the Vaillant S.54 fault code mean?

Your boiler has temporarily stopped itself because it has detected an issue with the water pressure or flow, and it is now waiting for a short period before it attempts to start again.

How much does it cost to fix Vaillant error code S.54?

Typical repair cost for the Vaillant S.54 fault is £80-150 including labour.

Vaillant S.54 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Appliance is within the waiting period of the operation block function due to water shortage (temperature gradient)

From this model's manual

Verified against the Vaillant/Vaillant Ecomax installation & service manual, page 45.

DIY fix possible

Check the pressure gauge on the front of the boiler; if it is below 1 bar, locate the filling loop.Open the filling loop valves to increase the system pressure to between 1 and 1.5 bar.Close the valves tightly and check the boiler display to see if the error clears.

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Related fault codes

F.22View →S.53View →

All 90 fault codes on the ecoMAX

Seeing a different code? Every code this model can display, in one place.

d.0 d.1 d.2 d.5 d.7 d.8 d.10 d.11 d.13 d.14 d.16 d.22 d.23 d.24 d.25 d.34 d.35 d.40 d.41 d.44 d.46 d.47 d.60 d.61 d.67 d.68 d.69 d.71 d.72 d.73 d.80 d.81 d.82 d.83 F.0 F.1 F.10 F.11 F.13 F.20 F.22 F.23 F.24 F.25 F.27 F.28 F.29 F.32 F.60 F.61 F.62 F.63 F.64 F.65 F.67 P.1 P.2 P.5 S.0 S.1 S.2 S.3 S.4 S.5 S.6 S.7 S.8 S.10 S.11 S.13 S.14 S.15 S.16 S.17 S.20 S.21 S.23 S.24 S.25 S.26 S.27 S.28 S.30 S.32 S.34 S.36 S.37 S.39 S.53

Your boiler has temporarily stopped itself because it has detected an issue with the water pressure or flow, and it is now waiting for a short period before it attempts to start again.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 90 fault codes on the ecoMAX

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