Why is one radiator cold when others are hot?

First check the thermostatic radiator valve (TRV) isn't stuck and the lockshield valve is open. If both valves are open and it's still cold, you likely have a sludge blockage or balancing issue.

How often should I bleed my radiators?

Bleed radiators annually, ideally before the heating season starts. If you need to bleed frequently, there may be an air ingress problem requiring professional investigation.

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Radiator Not Heating

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Licensed & Insured Gas-Certified Technicians Serving Vancouver Since 1999

Cold radiators — whether entirely cold or cold in spots — are the most visible sign of a heating system problem. The pattern of coldness tells you what's wrong: cold at the top means air, cold at the bottom means sludge, cold entirely means a valve or balancing issue, and radiators far from the boiler staying cold suggests pump or distribution problems.

While some radiator issues (bleeding air, adjusting valves) are DIY-friendly, persistent cold radiators often indicate system-level problems like sludge buildup, pump degradation, or incorrect system balancing. Our technicians diagnose the root cause across your entire heating system, not just individual radiators.

Diagnosing Cold Radiators by Pattern

Cold at the top and hot at the bottom = trapped air. Bleed the radiator. Cold at the bottom and hot at the top = sludge buildup. Power flushing is needed. Entirely cold = the radiator valve is closed, the lockshield valve is shut, or the system is unbalanced. One cold radiator far from the boiler = distribution or balancing issue. All radiators cold = pump or boiler fault.

Our Radiator Heating Repair Process

We survey all radiators in your home, checking temperature distribution, valve operation, and bleed points. We check system pressure, pump performance, and flow distribution. Depending on findings, we may bleed radiators, balance the system, flush individual radiators, or recommend a full system power flush. All work is quoted upfront.

This is not a DIY repair

Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.

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