Furnace Repair in Kitchener-Waterloo, Cambridge and Guelph

Most furnace breakdowns come down to a handful of parts: the igniter, the flame sensor, the pressure switch, the inducer motor, the blower motor or the control board. A trained technician can usually pin down which one in a single visit.

We repair furnaces in homes across Waterloo, Kitchener, Cambridge and Guelph, plus townships like Elmira, St. Jacobs, Breslau, Baden and New Hamburg. The region has everything from 1950s bungalows with original ductwork to new subdivisions with 10-year-old high-efficiency units, and each has its own common failures. If you want local detail, see our pages for furnace repair in Kitchener, Waterloo, Cambridge and Guelph.

A furnace that won't heat is usually a safety device doing its job: the furnace detects a problem and shuts itself down. The fix is finding why.

• Dirty filter. A clogged filter starves the furnace of air, it overheats, and the limit switch shuts the burners off. This is the most common cause of short cycling, and it's free to check.
• Dirty flame sensor. The burners light, then go out after a few seconds. A coated sensor can't confirm the flame, so the furnace shuts the gas off.
• Failed hot surface igniter. You hear the inducer motor start, but the burners never light. Igniters are a wear part and crack with age.
• Blocked or frozen venting. High-efficiency furnaces vent through white plastic pipes on the side of the house. In a Waterloo Region winter, snowdrifts and ice can block them and trip the pressure switch.
• Condensate problems. A plugged drain or a frozen condensate line will also stop a high-efficiency furnace.
• Blower motor or capacitor failure. The burners run but little or no air comes out of the vents.
• Thermostat issues. Dead batteries, wrong settings or a bad wire can look like a furnace problem.

Before you call, check the filter, the thermostat settings and batteries, the furnace power switch, and the vent pipes outside. If those look fine, call us.

A proper diagnosis covers safety first, then the fault. Our technician reads any error codes, checks the ignition sequence, measures gas pressure and temperature rise, tests the flame sensor, pressure switch and limit switches, and inspects the venting and condensate drain.

We also check for carbon monoxide and look at the heat exchanger. If we find a cracked heat exchanger or another hazard, Ontario rules require the appliance to be shut off and tagged until it's fixed. Our guide to a red-tagged furnace explains what a TSSA red tag means and what your options are. Make sure your home has working carbon monoxide alarms near every sleeping area; Ontario law requires them in homes with a fuel-burning appliance.

Repair is usually the right call when the furnace is under about 12 years old and the problem is a single part. Replacement starts to make sense when the furnace is 15 to 20 years old, needs a major part like a heat exchanger or inducer, or has needed several repairs in the last couple of years.

A simple rule of thumb: if the repair costs more than about a third of a new furnace and the unit is past 15 years, get a replacement quote before spending the money. Older mid-efficiency furnaces (around 80% AFUE) also cost noticeably more to run than a modern 95%+ unit. We'll give you both numbers and let you decide. If replacement is on the table, read our furnace replacement cost guide or see our furnace installation page.

Typical market ranges in the region: a cleaned flame sensor or reset is often in the low hundreds, an igniter or pressure switch a few hundred dollars, and an inducer motor, blower motor or control board can run from several hundred to over $1,000 installed.

These are typical regional ranges, not our prices. Your quote depends on the part, the brand, whether the furnace is still under the manufacturer's parts warranty, and access. We give you the price before we start. Members of our $30/month maintenance membership get 10% off repairs, and financing is available for larger jobs.