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Radiator Not Working? Diagnose & Fix
Simple checks to identify the root cause.
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How to Bleed a Radiator
Remove trapped air and stop gurgling.
How to Balance Radiators
Use lockshields to improve flow across your system.
Diagnose & Quick Fixes
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Radiator Not Working?
Start here for cold spots, one cold radiator and more.
Noises: Gurgle/Whistle/Kettling
Identify the sound and apply the right fix.
Airlock in your System
Two common causes—how to tell them apart.
Air & Bleed
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How to Bleed a Radiator
Step‑by‑step with photos and safety notes.
Bleeding a Combi System
Pressure checks and safe sequencing.
After Bleeding: Re‑pressurise
Restore boiler pressure and test.
Balance & Flow
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How to Balance Radiators
¼‑turn lockshield adjustments and retesting.
Lockshield Valves Explained
What they do and how to set them.
Flush Sludge from a Radiator
When to DIY and when to call a pro.