What does the Vaillant D.22 fault code mean?

Your boiler is currently providing hot water to your taps or shower, which is a normal status message rather than an actual fault.

How much does it cost to fix Vaillant error code D.22?

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

Vaillant D.22 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Hot water demand

From this model's manual

Verified against the Vaillant/Vaillant Ecotec Plus Pro 839592 05 2006 installation & service manual.

What causes this fault?

This status appears when the boiler detects that a hot water tap or shower has been turned on, triggering the internal flow sensor. It indicates that the burner has fired up specifically to heat the water for your domestic use rather than for your central heating. Because this is a normal operational message, it does not mean your boiler has stopped or broken down.

DIY fix possible

Check if a hot water tap is accidentally left runningEnsure there are no dripping taps or leaking hot water pipesSimply wait for the message to disappear once you finish using hot water

Find a Gas Safe engineer

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Boiler cover options

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Related fault codes

S.14View →S.24View →

All 135 fault codes on the ecoTEC plus 612 R1 VU GB 126/3-5

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

35 96 con Connection D,11 D.0 D.1 D.2 D.3 D.4 D.5 D.7 D.8 D.9 D.10 D.12 D.13 D.17 D.18 D.20 D.23 D.25 D.27 D.28 D.30 D.33 D.34 D.35 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.75 D.76 D.77 D.78 D.80 D.81 D.82 D.83 D.84 D.90 D.91 D.93 D.96 D.97 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.49 F.61 F.62 F.63 F.64 F.65 F.67 F.70 F.71 F.72 F.73 F.74 F.75 F.76 F.77 F.78 F70 P.0 P.1 P.2 P.3 P.4 P.5 P.6 S. 2 S. 5 S.0 S.1 S.3 S.4 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.22 S.23 S.24 S.25 S.26 S.27 S.28 S.30 S.31 S.32 S.34 S.36 S.41 S.42 S.52 S.53 S.54 S.96 S.97 S.98

Your boiler is currently providing hot water to your taps or shower, which is a normal status message rather than an actual fault.

What the manual says

What causes this fault?

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 135 fault codes on the ecoTEC plus 612 R1 VU GB 126/3-5

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