Radiators Not Heating

When some radiators heat and others don't, the boiler is usually fine and the trouble is in a zone or a loop, so call and say which rooms went cold.

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When this becomes an emergency

A whole zone stays cold while another zone heats normally.
One radiator never gets warm no matter how long the boiler runs.
You can hear water trickling inside a radiator that stays cool.
A finished basement addition never keeps up with the original part of the house.

What a pro does

The pattern of what's cold tells most of the story. An entire zone going dark points at a zone valve, a circulator, or the end switch that's supposed to tell the boiler to fire for that loop, and a tech can check each of those in a few minutes with a meter at the panel. A single cold radiator in an otherwise warm zone is a different problem, usually air trapped at that emitter or a valve that has seized. Trickling water inside a cool radiator is the classic sound of an air pocket. Retrofit loops added for a later addition are worth their own look, since they're often tied in without proper balancing.

Frequently asked questions

What is a zone valve and how does it fail?

It's a small motorized valve that opens a loop when that zone calls for heat. The motor or the end switch inside it is what typically gives out, not the valve body.

Why does a newer addition heat worse than the original house?

A loop added later often shares a circulator that wasn't sized for the extra length, and without balancing the new run gets whatever flow is left over.

Does trapped air work itself out over time?

Sometimes a system with a good air separator clears itself, but plenty of loops hold a pocket indefinitely until it's purged deliberately.

Should every radiator feel the same temperature?

Not exactly the same, since the ones nearest the boiler usually run a bit hotter, but a radiator that stays at room temperature is telling you something.

Radiators Not Heating?

Get connected with a local pro now.

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