BoilerFaultCodesYour boiler is simply in energy-saving mode, which means it will not pre-heat your hot water in order to save on fuel costs.
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: Eco mode is active
What causes this fault?
This is not a mechanical failure but a user-selected settings choice. It occurs when the 'Eco' button has been pressed, instructing the boiler to disable the internal pre-heat function which normally keeps a small reservoir of water hot at all times. While this saves money on heating bills, it means you may have to wait a little longer for hot water to reach your taps.
DIY fix possible
Locate the ECO button on the boiler control panelPress and hold the ECO button until the light turns off if you prefer instant hot waterLeave the setting as it is if you wish to continue saving energy
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 ECO — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.