Is it safe to keep the furnace running?
Most furnace faults are an inconvenience rather than a danger. The furnace notices something is wrong, locks itself out and waits. Two situations are different. If you smell gas, leave the house without switching lights or appliances on or off, and call your gas supplier's emergency line from outside. If a carbon monoxide alarm sounds, get everyone into fresh air and call 911. The Ontario Fire Code requires a working carbon monoxide alarm next to each sleeping area in any home with a fuel-burning appliance, a fireplace or an attached garage, so if you are not sure yours work, test them tonight.
Short of those two, a furnace that has stopped is a comfort problem, not an emergency for the house. Close the curtains, keep interior doors open so warmth spreads evenly, and in a long cold spell open the cabinet doors under sinks on outside walls so the pipes get some heat.
What can you safely check before calling?
A few checks need no tools and no panels removed. Make sure the thermostat is set to heat and a few degrees above the room, and replace its batteries if it has them. Find the furnace power switch, which looks like a light switch on or near the furnace, and confirm it is on, then check the breaker. Pull the filter and look at it; a grey, clogged filter can shut a furnace down on its own. On a high-efficiency furnace, go outside and make sure the two plastic pipes on the wall are clear of snow and frost, and look at the small drain tube from the furnace to see that it is not kinked or sitting in standing water.
Turning the furnace switch off for a minute and back on is a reasonable reset, once. If the furnace tries, fails and locks out again, leave it there. Repeated resets do not clear the cause, and they can make the fault harder to read. Do not take off the burner cover, touch the gas valve or bypass any switch. Our guide on why a furnace won't turn on and whether it is safe to reset it goes through these steps in more detail.
What do the common symptoms usually mean?
No heat at all, with the thermostat calling, most often comes down to a few small parts. The igniter may be cracked, the flame sensor may be coated so the furnace cannot confirm a flame, or the pressure switch may not close because a vent or condensate line is blocked. Less often the control board itself has failed. A blinking light on the board usually points to which one, and it is worth noting the pattern before you call.
Cold air from the vents has two usual stories. Either the fan is set to run all the time on the thermostat, which is harmless, or the burners light and then shut off while the blower keeps going. That second pattern is often an overheating limit switch caused by a dirty filter, a weak blower or restricted ducts. Short cycling, where the furnace runs for a minute or two and stops, shares those causes and can also come from a thermostat placed near a heat source or a furnace too large for the house.
Noises are worth describing as precisely as you can. A squeal often means a blower motor bearing. A rattle or rising hum at start-up is usually the inducer motor, the small fan that clears the flue before ignition. Repeated clicking with no flame means ignition is failing. A loud bang or boom when the burners light is delayed ignition; switch the furnace off at its power switch and leave it off until a technician has looked.
Which faults turn up in which Stoney Creek houses?
On the mountain, the Felker, East Felker and Heritage Green subdivisions were built from the 1990s onward with forced-air gas furnaces and central air. Many original furnaces there are now near the end of their life, and the faults technicians find match that age: worn inducer motors, failing control boards and wear on the heat exchanger. Heat exchanger wear is the one finding that changes the conversation, because it can let combustion gases into the house air. If the technician sees it, the furnace stays off and you are given a written price for replacement alongside an explanation of what was found.
In Fruitland and Winona, the newer houses typically have high-efficiency condensing furnaces with plastic venting and an HRV or ERV. The calls there are often about condensate drains that block or freeze, wall vents buried by snow and ventilation units that have never been cleaned. These are usually quick to put right and easy to prevent with regular maintenance.
The older houses of Olde Towne along King Street and Lake Avenue were built for wood or coal and converted later, so ducts can be undersized or oddly routed, which pushes a modern furnace to overheat and cycle. Some rural properties above the escarpment are not on a natural gas main and heat with propane or oil, so please confirm your fuel before booking.
How does a repair visit go?
When you get in touch, tell us what the furnace is doing, any light pattern on the board, roughly how old the furnace is and which fuel it uses. The technician starts by confirming the symptom with you, then tests the system and shows you what was found, in plain words.
Before any part is fitted you see a written price and decide whether to go ahead. Work is performed by TSSA-certified gas technicians, and gas and propane furnaces are repaired to the CSA B149.1 Natural Gas and Propane Installation Code.
If your furnace is still within the manufacturer's warranty, have the paperwork or model and serial numbers handy, since some parts may be covered by the manufacturer. If the furnace is older and the repair would be a large share of the cost of a new one, the technician will lay out both options so you can think it over rather than decide on the spot. You can request a visit or contact us with any questions.