Cold radiators have one of three causes: cold at the bottom (sludge build-up — needs a powerflush), cold at the top (trapped air — needs bleeding), or completely cold (closed valve, seized lockshield or pump fault).
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| Cold location | Likely cause | Fix |
|---|---|---|
| Cold at the bottom | Sludge build-up | Powerflush |
| Cold at the top | Trapped air | Bleed the radiator |
| Cold all over | Closed valve / seized lockshield / pump | On-site diagnosis |
| Only upstairs cold | Pump weak or air-locked | Pump test, possibly replace |
| Only downstairs cold | Balancing issue | Re-balance flow on lockshields |
Turn the heating off, use a bleed key on the small valve at the top corner of the radiator, hold a cloth underneath, and turn slowly until water (not air) comes out. Top up boiler pressure afterwards.
No — powerflushing requires a 200+ litre/minute pump and specific chemicals. DIY 'flushes' through a garden hose do not clear sludge and can damage the boiler.
Honest pricing, RGII certified, same-week appointments across Kildare and Dublin.