Intergas Boiler Fault Codes

Oil Natural Gas

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
1	Low	Your boiler is currently working at its lowest heating level and is not reporting a fault.	Yes
2	Low	Your boiler is currently working at its maximum set power to heat your radiators as quickly as possible.	Yes
3	High	Your boiler is trying to start up but the fan is moving at the wrong speed, preventing the heating from firing up safely.	Engineer
4	High	Your boiler is trying to start up but cannot successfully light the gas to create a flame.	Yes
5	Low	Your boiler is simply showing that it is currently working to heat your radiators, which is a normal operating status rather than a fault.	Yes
6	Low	Your boiler is simply indicating that you have turned on a hot tap or shower and it is successfully heating the water for you.	Yes
7	Low	Your boiler is currently heating up its internal water reserve so that hot water is available instantly when you turn on a tap.	Yes
h	Low	Your boiler is not broken; it is simply working at its maximum set power level to heat your home quickly.	Yes
HH	Low	Your boiler is currently running at its highest power level for testing purposes and is not indicating a system failure.	Yes
L	Low	Your boiler is currently running at its lowest setting to prevent it from shutting down completely while it tries to manage your heating demand.	Yes
LL	Low	Your boiler is currently in a manual testing mode where it runs at its lowest power level, often used by engineers during a service.	Yes

Monthly cover means no unexpected bills when your boiler breaks down.

Top rated

OpenFix

Boiler & heating care plans

Hometree

from £12.95/month

HomeServe

from £8.00/month

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