Radiators Not Heating

Cold radiators in a system that otherwise runs usually means something local and fixable in that loop, so call and mention which rooms have gone cold.

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When this becomes an emergency

Certain radiators stay stone cold while the rest of the house warms up normally.
A radiator gets hot along the bottom and stays cool across the top.
There's loud knocking in the pipes shortly after the system starts.
A vent on a radiator is hissing continuously or spitting droplets.

What a pro does

A few cold radiators point away from the boiler, not toward it. On hot-water loops the classic cause is trapped air riding high in the system, which explains a radiator hot at the bottom and cold above, and bleeding it back down only holds if whatever let air in gets found. Steam behaves differently, and that's the split a tech makes early. There the air vent is the gatekeeper, and a vent clogged with scale or stuck closed keeps steam from ever reaching that radiator no matter how hard the boiler works. Circulator performance, zone valve position and pipe pitch all get checked too, because a house heated continuously for most of the year wears those components far harder than a mild-climate system ever does.

Frequently asked questions

Why is one radiator cold when the boiler clearly runs?

Because the fault is usually in the path to that radiator rather than the heat source, most often a trapped air pocket, a stuck vent, or a valve that has seized partway shut.

Does trapped air keep coming back?

It does if the system is drawing air in somewhere. Repeated bleeding on the same radiator is a sign of a leak, an autofill problem, or an expansion tank issue rather than a one-time nuisance.

What causes the banging sound in the pipes?

Water sitting where steam wants to travel gets shoved hard down the line. It usually traces to pipe pitch or a failing trap, not to the radiator making the noise.

Are old cast iron radiators worth keeping?

Generally yes. They hold heat well through long cold spells, and most complaints about them come down to vents, valves and air rather than the radiator body itself.

Radiators Not Heating?

Get connected with a local pro now.

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