BoilerFaultCodes.com
Complaints of noise (2) Low

Your boiler is making loud noises because trapped air bubbles are causing the water to rattle as it circulates through your heating system.

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: Air in system.
Typical repair cost £0-£90 (including labour)

DIY fix possible

Turn off your boiler and wait for the radiators to cool down completely.Use a radiator key to open the bleed valve at the top of each radiator until water flows out steadily with no hissing air.Check your boiler's pressure gauge and top it up to the manufacturer's recommended level, typically between 1 and 1.5 bar.

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 Complaints of noise (2) — 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 Flexiflame 140 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