BoilerFaultCodes.com
S.04 Low Information

Your boiler is operating normally and is currently firing the burner to provide central heating to your home.

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: Heating mode – burner ignited

What causes this fault?

This is not actually a fault, but a status message indicating that your boiler is working correctly. It appears because the system has received a request for warmth and has successfully lit the burner to heat the water for your radiators.

You will see this code more frequently during the autumn and winter months when your central heating is scheduled to be active.

Typical repair cost £0 (including labour)

DIY fix possible

No action is required as this is a status code, not an error.Adjust your thermostat or timer if you do not want the heating on.Wait for the boiler to reach the set temperature and the status will change.

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 S.04 — 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