Why Your Boiler's Full But Radiators Are Lukewarm: Unraveling the Misunderstanding from Five Years Ago

Can I fix this issue myself?
Some issues like bleeding radiators or adjusting the pressure can be done by the homeowner. However, for more complex problems, such as pump failure or internal blockages, you may need a professional plumber or heating engineer.

What could the plumber have gotten wrong five years ago?
It’s possible that the plumber incorrectly diagnosed the system’s issue or overlooked maintenance tasks that have now worsened over time, such as improper pressure settings, blocked pipes, or malfunctioning components.

Is it normal for radiators to be only slightly warm?
No, radiators should be hot to the touch. If they are lukewarm, there is a problem in the system that needs to be addressed, such as airlocks, blockages, or a malfunctioning pump.