Furnace Repair Barrie

Furnace Problems We Fix Most Often

Furnace not heating, or blowing cold air

When the blower runs but the air stays cool, the burners usually aren’t lighting or aren’t staying lit. A dirty flame sensor is the most common reason. It’s a quick fix, but it often keeps coming back if the underlying cause isn’t addressed. Failed hot surface igniters, faulty gas valves and blocked venting are the other usual suspects.

Short cycling (turning on and off)

A furnace that fires for a minute or two and shuts down is often overheating because of a clogged filter or closed vents. It can also be a sensor or pressure switch fault, or a furnace that’s simply too big for the house. Short cycling wears out parts quickly and pushes up your gas bill.

Banging, squealing or rumbling

A loud bang at startup usually means delayed ignition, where gas builds up before it lights. Squealing tends to point to the blower motor or its bearings, and a rumble after the burners shut off can mean a burner or gas pressure issue. Our article on what different furnace noises mean goes through each sound in more detail.

Uneven heat between floors

If the basement is warm and the bedrooms upstairs never are, the cause may be a weak blower, a dirty coil, unbalanced ductwork or leaky ducts in an unheated space. We check the furnace first, then look at how air is moving through the house.

Water around a high-efficiency furnace

High-efficiency furnaces produce condensate. When the drain trap clogs or the condensate pump fails, water backs up, and the furnace may lock itself out as a safety measure. It’s usually a straightforward repair once it’s diagnosed.