What does the Vaillant D.81 fault code mean?

This is an information code rather than a fault, showing you the total number of hours your boiler has spent heating up your water.

How much does it cost to fix Vaillant error code D.81?

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

Vaillant D.81 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Operating hours hot water generation

From this model's manual

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

What causes this fault?

This code is not caused by a breakdown or failure, but is simply a recorded log of the appliance's usage. It appears when the control board reaches a specific interval or when a user accesses the diagnostics menu to check the system's workload. It acts like a mileage counter on a car, tracking how much work the boiler has done specifically for your taps and showers.

DIY fix possible

Press the 'Back' or 'i' button to exit the status menuMonitor your boiler for any actual fault codes starting with 'F'No action is required as this is a normal operational reading

Find a Gas Safe engineer

Search the official register →

Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like D.81: no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

D.80View →D.82View →D.83View →

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.22 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.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

This is an information code rather than a fault, showing you the total number of hours your boiler has spent heating up your water.

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

Related guides you might find useful

Is boiler cover worth it?

When to replace your boiler

Boiler service cost

Recently viewed