What does the Vaillant S.15 fault code mean?

Your boiler is simply running its fan and water pump as part of its normal operation or safety check, so you do not need to worry.

How much does it cost to fix Vaillant error code S.15?

Cost varies. Contact a Gas Safe registered engineer for a quote.

Vaillant S.15 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Fan and pump running

From this model's manual

Verified against the Vaillant/Vaillant Ecotec Plus Pro 839592 00 2004 installation & service manual.

DIY fix possible

Wait a few moments to see if the boiler automatically moves on to the next stage of heating.Check if the heating or hot water comes on normally.If the code stays on permanently and your heating stops working, simply restart the boiler.

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Related fault codes

S.30View →S.31View →F.28View →

All 119 fault codes on the ecoTEC plus 612 VU GB 126/3-5

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

d.00 d.01 d.02 d.03 d.05 d.06 d.07 d.08 d.09 d.10 d.11 d.17 d.18 d.19 d.22 d.23 d.25 d.26 d.30 d.33 d.34 d.35 d.36 d.40 d.41 d.44 d.47 d.50 d.51 d.60 d.61 d.64 d.65 d.67 d.68 d.69 d.70 d.71 d.72 d.73 d.75 d.76 d.77 d.78 d.80 d.81 d.82 d.83 d.84 d.90 d.91 d.93 d.97 F.00 F.01 F.02 F.10 F.11 F.13 F.20 F.22 F.23 F.24 F.27 F.28 F.29 F.32 F.60 F.61 F.62 F.63 F.64 F.65 F.70 F.71 F.72 F.73 F.74 F.75 F.76 P.1 P.2 P.3 P.4 P.5 P.6 S.00 S.01 S.02 S.03 S.04 S.05 S.06 S.07 S.08 S.10 S.11 S.13 S.14 S.16 S.17 S.20 S.21 S.22 S.23 S.24 S.25 S.26 S.27 S.28 S.30 S.31 S.32 S.34 S.36 S.53 S.54 S.76

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Your boiler is simply running its fan and water pump as part of its normal operation or safety check, so you do not need to worry.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 119 fault codes on the ecoTEC plus 612 VU GB 126/3-5

Related guides you might find useful

Banging, kettling or whistling noise

Is boiler cover worth it?

When to replace your boiler

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