Your boiler has reached the required temperature and is taking a short, normal break before it starts heating again.
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: The desired CH supply temperature has been reached. When the temperature has fallen sufficiently and the anti cycle time has passed the shutdown is cancelled.
What causes this fault?
This occurs when your radiators have reached the maximum temperature set on the boiler's control panel. The boiler temporarily turns off the burner to prevent the system from overheating, ensuring it operates efficiently rather than wasting energy. Once the water inside the unit cools down by a few degrees, it will automatically fire back up to maintain your home's warmth.
This code is more frequent during autumn and spring when the weather is milder and the heating system doesn't need to work at full capacity to keep the house warm.
DIY fix possible
No action is required as this is normal operation.Wait a few minutes for the boiler to restart automatically.Check that your room thermostat is turned up if the house is still cold.
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.