When a no-heat call is genuinely an emergency
Not every furnace fault needs a middle-of-the-night visit. These situations usually do, especially during a cold snap or lake-effect event:
- The furnace produces no heat at all and indoor temperature is falling steadily.
- Indoor temperature is already below roughly 60°F and outdoor temperatures are near or below freezing.
- A carbon monoxide alarm has sounded (leave first, then call).
- You smell gas near the furnace or anywhere in the home (leave first, call the gas utility).
- There are infants, elderly residents, or anyone with a medical vulnerability in the home.
- Water lines run through unheated crawl spaces, garages, or along poorly insulated exterior walls.
Gas odor or CO alarm comes before everything else
If you smell gas or a carbon monoxide alarm sounds, leave the house immediately with everyone inside, do not operate light switches or garage doors, and call the gas utility or 911 from outside. Call us for repair only after the property has been cleared as safe.
Before you call: a two-minute check
These checks are safe for any homeowner and occasionally solve the problem outright. They also give us useful information if they do not.
- 1
Thermostat mode and setpoint
Confirm it is set to HEAT, not COOL or OFF, and raise the setpoint five degrees above room temperature. Watch for the call-for-heat indicator.
- 2
Thermostat power
A blank or dim display often means dead batteries. Fresh batteries are a common fix for a furnace that simply never gets the signal.
- 3
Furnace switch and breaker
Most basement furnaces have a wall switch that looks like a light switch. Check it, then check the breaker panel for a tripped heating circuit.
- 4
Filter and error code
A visibly clogged filter can trip a limit switch. Note any blinking LED code visible through the furnace sight glass and tell us the pattern when you call.
Where DIY stops
Do not bypass a safety switch, open a gas valve, take apart burners or the heat exchanger, jump control board terminals, or work on live wiring. Those steps create fire, gas, and carbon monoxide risk and often turn a small repair into a large one.
No heat right now? Call 716-412-2677 for 24/7 service availability.
Call now for a free quote and service availability. Please have your 5-digit ZIP code ready.
What an after-hours furnace visit involves
An emergency call is a diagnostic visit first. The goal is to find out why the furnace stopped, confirm it is safe, and restore heat where the parts and conditions allow.
- 1
Symptom review
What the furnace did, when it stopped, any noises, smells, or error codes, and whether it has failed before.
- 2
Sequence-of-operation test
The furnace is watched through its startup sequence — thermostat call, inducer, pressure switch, ignitor, gas valve, flame proving, blower — to see exactly where it stops.
- 3
Component testing
Electrical and mechanical testing on the suspect part rather than guesswork replacement: flame sensor microamps, ignitor resistance, pressure switch operation, capacitor value, limit continuity.
- 4
Repair options explained
You hear what failed, what it costs to correct, and whether the age and condition of the system make a repair-versus-replacement conversation worth having.
Failures that cause most Buffalo no-heat calls
| What failed | What you notice | Why it happens here |
|---|---|---|
| Hot surface ignitor | Inducer runs, then the furnace goes quiet without lighting | Ignitors are consumable and fail after thousands of heating cycles — and Buffalo furnaces cycle a lot |
| Dirty flame sensor | Burners light for a few seconds, then shut off; repeats and locks out | Oxidation builds over a long heating season and the furnace can no longer prove flame |
| Pressure switch / blocked vent | Inducer runs but the furnace never advances to ignition | Snow drifts and ice over sidewall PVC intake and exhaust terminations |
| Clogged filter / limit trip | Furnace heats briefly, shuts off hot, restarts repeatedly | Closed-up houses and dry winter air load filters quickly |
| Run capacitor or blower motor | Humming at the furnace, little or no airflow at registers | Long run hours through a five-to-six-month heating season |
Protecting the house while you wait
- Close off unused rooms and keep interior doors to occupied rooms open.
- Open cabinet doors under kitchen and bath sinks on exterior walls.
- Let a pencil-thin trickle run from the faucet furthest from the water main during a hard freeze.
- Close blinds and curtains at night, open south-facing ones during daylight.
- Use blankets and layers rather than an unvented combustion heater indoors.
- Never heat a home with an oven, range, or outdoor grill — that is a carbon monoxide risk.
Space heaters are fine in moderation, but keep them three feet from bedding and furniture, plug them directly into a wall outlet rather than a power strip, and do not leave them running in an unoccupied room.
Buffalo-specific things that break furnaces in the worst weather
Lake-effect snow off Lake Erie can drop a foot or more in a narrow band while a few miles away it barely dusts. High-efficiency furnaces vent through PVC pipe that exits low on a sidewall, and that termination is exactly where drifting snow collects. When the intake or exhaust gets covered, the pressure switch does its job and shuts the furnace down. Keeping that pipe clear after a heavy snowfall prevents a surprising number of after-hours calls in North Buffalo, South Buffalo, and the Southtowns.
Older housing stock across the West Side, Black Rock, Kaisertown, and University Heights often runs an original basement furnace on undersized or partially closed return ductwork. Those systems run long and cycle hard during a cold stretch, which is when marginal ignitors, capacitors, and flame sensors finally give up.