BoilerFaultCodes.com
30 40 50 60 70 80 [m m m l l l] High

Your boiler has detected that hot water is not flowing properly around your heating system, so it has shut down to prevent damage.

Call an engineer soon

Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: lack of water circulation.
Typical repair cost £120-250 (including labour)

DIY fix possible

Check your central heating pressure gauge; if it is below 1 bar, use the filling loop to top it up to approximately 1.5 barEnsure all radiator valves and any system isolation valves are fully openOnce pressure is restored, reset the boiler using the reset button

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 30 40 50 60 70 80 [m m m l l l] — 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.

Chaffoteaux Minima HE is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

UK's #1 online installer
Boxt
Fixed-price online quotes. Next-day installation.
Get a free quote →
Heatable
Instant online boiler quotes from £1,499.
Get a free quote →
iHeat
Fast installation. Price match guarantee.
Get a free quote →

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

Related fault codes