BoilerFaultCodes.com
D.81 Low Information

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

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Operating hours hot water generation

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.

Typical repair cost £0 (including labour)

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 for a qualified engineer in your area.

Gas Safe Register →

Protect yourself from future repair bills

A boiler cover plan would cover faults like D.81 — no call-out fees, no surprises.

Top rated
OpenFix
Boiler & heating care plans
Get a quote →
Hometree
from £12.95/month
Get a quote →
HomeServe
from £8.00/month
Get a quote →

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

Related fault codes