BoilerFaultCodes.com
8 Medium Lockout

Your boiler has been reset too many times in a short period and has now locked itself out for safety.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Maximum number of resets

What causes this fault?

This fault occurs when the reset button has been pressed more than five times within a fifteen-minute window. It is a safety feature designed to prevent you from repeatedly trying to start a boiler that has an underlying technical issue. Instead of firing, the control board disables the reset function temporarily to protect the internal components from damage.

Typical repair cost £0-120 (including labour)

DIY fix possible

Turn the boiler off at the main electrical fused spur switch.Wait for 30 seconds.Turn the power back on to clear the lockout memory.

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 8 — 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