BoilerFaultCodes.com
L Low Information

Your boiler is working normally but the temperature of the water going to your radiators is currently set to a low level.

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: Boiler operating, low flow temperature selected.

What causes this fault?

This code appears when the user-adjustable temperature dial for the central heating is set to a very low position. It is simply an status indication that the boiler is successfully firing but is restricted to producing lukewarm water for your radiators. This often happens if the dial has been bumped or turned down during warmer weather.

This code is frequently seen in Autumn when homeowners first turn their heating back on but have forgotten the thermostat or boiler dial was set to a minimum over the summer.

Typical repair cost £0 (including labour)

DIY fix possible

Locate the temperature control dial on the front of the boilerTurn the dial clockwise to increase the flow temperatureWait to see if the radiators reach your desired warmth

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 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.

Potterton Envoy 30 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