BoilerFaultCodesYour boiler is currently idle and waiting for a command to provide heating or hot water, meaning it is working exactly as it should.
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: Stand-by
What causes this fault?
This code appears when the boiler is in a resting state because it has reached the desired temperature or there is no current demand from your thermostat. It is a normal part of the boiler's operating cycle and indicates that the system is powered on and ready to work. Once you turn up your heating or use a hot water tap, the code will change to represent an active burner.
This status is more frequently seen during summer months when the central heating is turned off and the boiler only wakes up briefly to provide hot water.
DIY fix possible
Check that your room thermostat is turned upEnsure your programmer or timer is set to 'ON'Open a hot water tap to see if the boiler fires up
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 0 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Maximiser SE 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.
Affiliate links — we may earn a commission at no extra cost to you.