Raidiators uneven

Some radiators in my house are only part heating up. The raidiators are only a few years old and we had a new boiler installed 3 months ago.

The boiler installer said they balanced the system but could this be the cause? The raidiator in the bedroom furtherest from the boiler upstairs only gets hot the left side, the room next to it has 3 or 4 columns that don't heat and the tall radiator that is in the living room, furtherest from the boiler only gets luke warm. All raidiators have been bled and have no air and the pins in the TRVs are loose.

Asked by T on 11th Feb 2026
Expert Trade Answers
"If they are designer radiators they may have been installed incorrectly. Sometimes the flow must enter the correct side on the radiator for it to work properly."
Answered on 11th Feb 2026 - Member since Dec 2023 - report
"In my opinion this still could be a unbalanced system or sludge in the system, if radiators are unbalanced certain radiators will get hot and others will only get luke warm."
Answered on 11th Feb 2026 - Member since Feb 2026 - report
"I believe they need balancing from bottom to top all radiators also they need to check if they were installed correctly the column radiator are directional, you need to book a expert to diagnose the issue"
Answered on 11th Feb 2026 - Member since Jun 2024 - report
"From my opinion, when you had the new boiler installed did they power flush the system as could also be a build up of sludge"
Answered on 11th Feb 2026 - Member since Dec 2025 - report
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