What does the Vaillant F.24 fault code mean?

Your boiler is locking out because the water inside is heating up much too quickly, usually due to low water pressure or a blocked circulation path.

How much does it cost to fix Vaillant error code F.24?

Typical repair cost for the Vaillant F.24 fault is £150-300 including labour.

Can I fix Vaillant fault code F.24 myself?

Check your boiler's pressure gauge to ensure it is between 1 and 1.5 bars.

Vaillant F.24 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Water shortage, temperature rise too quick

From this model's manual

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

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register →

Boiler cover options

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Related fault codes

F.22View →F.23View →

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.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.15 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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1 to 1.5 bar when cold on most UK boilers, from the manuals.

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Your boiler is locking out because the water inside is heating up much too quickly, usually due to low water pressure or a blocked circulation path.

What the manual says

Engineer required

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

What pressure should my boiler be?

Boiler keeps losing pressure

How to bleed a radiator

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