BoilerFaultCodesYour boiler is currently sitting in standby mode because it hasn't been told to turn on by your thermostat or timer.
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: Standby, no demand for heat present
What causes this fault?
This code appears when the boiler is waiting for a signal from your heating controls to start the burner. It usually means the room thermostat is satisfied, the timer is in an 'off' period, or there is a communication issue between your controls and the boiler. It is not an internal boiler failure, but rather a sign that the system is currently resting.
This is frequently seen in spring and autumn when the weather is unpredictable and the indoor temperature often reaches the thermostat's set point, causing the boiler to rest.
DIY fix possible
Check that your room thermostat is turned up higher than the current room temperature.Ensure your programmer or heating clock is set to 'ON' or 'AUTO'.Check if the batteries in your wireless thermostat need replacing.
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 o — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Classic M3050 M5080 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.