What Should I Do If My Furnace Stops Working in Winter?
If your furnace stops working in winter, start with a few safe checks: make sure the thermostat is functioning, confirm the furnace has power, look for any airflow issues, and check whether the breaker has tripped. If you smell gas, smell burning, hear unusual noises, or the furnace still will not run, stop troubleshooting and call for heating repair.
A no-heat situation can make a home feel uncomfortable fast, especially at night or during a cold snap. We’ll give you a quick, safety-first path for what to check and what to avoid. For a fuller winter checklist, visit our guide on what to do when your furnace goes out in winter.
Furnace Outage at a Glance
Question | Quick Answer |
|---|---|
What should I check first? | Start with the thermostat, power switch, breaker, and air filter. |
Should I relight the pilot myself? | Only follow your furnace manual. If you are unsure, do not attempt it and call a professional instead. |
Is a no-heat furnace an emergency? | It can be, especially if temperatures are low, vulnerable people are in the home, or there are gas or burning smells. |
Can I use a space heater while waiting? | Yes, only if you use it safely and don’t leave it unattended. If you smell gas, get out of your home immediately and call 911. |
When should I call YES!? | Call if the furnace will not restart, the breaker trips again, the system smells unsafe, or your home is getting too cold. |
What To Check First
Look at the thermostat. Make sure it is set to heat, and the temperature is set higher than the current room temperature. If the display is blank, the thermostat may need batteries or power.
Check the furnace power switch. Many furnaces have a switch nearby that looks like a regular light switch. If it was accidentally turned off, the furnace will not run.
Check the breaker once. If the furnace breaker has tripped, you can reset it one time. If it trips again, do not keep resetting it. That can point to an electrical or equipment issue.
Look at the air filter. A very dirty filter can restrict airflow and contribute to heating problems. If the filter is packed with dust, replace it with the correct size and type.
Make sure vents are open and clear. Blocked vents can make comfort worse and may affect airflow. Move furniture, rugs, or storage items away from supply and return vents.
Check for obvious warning signs. Stop immediately if you smell gas, smell burning, see scorch marks, hear loud banging, or notice the furnace cycling strangely.
What To Do If Your Home Is Getting Cold
If This Is Happening | What You Can Do | Why It Helps |
|---|---|---|
One room is warmer than others | Gather everyone in that room for a while. | It is easier to keep one area comfortable than the whole home. |
Cold air is coming through windows | Close curtains, blinds, and interior doors. | This may slow heat loss while you wait. |
You have safe extra heat available | Use a space heater according to the manufacturer’s directions. | It can provide temporary warmth in one occupied room. |
The house is getting very cold | Check on older adults, children, pets, and anyone with health concerns. | Some people are more vulnerable to cold indoor temperatures. |
You may be waiting a while | Keep phones charged and gather blankets, warm clothes, water, and medications. | A little preparation makes the wait less stressful. |
When the furnace is still down, your next job is keeping people safe and reasonably warm while you arrange service.
Ready.gov recommends preparing for winter weather by planning for power outages, using carbon monoxide alarms, and avoiding unsafe heat sources.
Furnace Safety Red Flags
Warning Sign | Why It Matters | What To Do |
|---|---|---|
Gas smell | Could point to a gas leak or unsafe combustion issue. | Leave the area and call for emergency help. |
Burning smell | Could point to overheating, electrical issues, or dust burning off if mild and brief. | If strong or persistent, shut the system off and call a professional. |
Carbon monoxide alarm sounds | Carbon monoxide can be life-threatening. | Leave the home and call emergency services. |
Breaker trips again | Repeated tripping can point to an electrical problem. | Stop resetting it and schedule service. |
Furnace makes loud or unusual noises | Banging, grinding, or screeching can signal a mechanical issue. | Turn the system off and call for repair. |
No heat after basic checks | The problem may be inside the furnace. | Schedule a heating inspection or repair. |
The CDC warns that carbon monoxide is an odorless gas that can cause sudden illness or death, and it specifically advises against heating your home with a gas oven.
What Not To Do During a Furnace Outage
A cold home can make anyone want a fast fix. Still, some shortcuts are not worth the risk.
Do not:
Keep resetting a breaker that trips
Use an oven or stove to heat your home
Run a generator indoors or near windows
Leave a space heater running while you sleep or leave the room
Place a space heater near bedding, curtains, furniture, or clothing
Try to relight a furnace unless your manual tells you how and you feel fully comfortable
Ignore gas smells, burning odors, or carbon monoxide alarms
The NFPA recommends keeping anything that can burn at least three feet away from heating equipment, including space heaters.
When a No-Heat Problem Needs Professional Repair
If the thermostat, switch, breaker, and filter all look normal, the issue may be inside the furnace. Common repair-related causes can include ignition problems, blower motor issues, a faulty limit switch, a thermostat problem, a dirty flame sensor, or another component that needs testing.
You do not need to diagnose the exact part before calling. What matters is that the furnace is not doing its job, and your home needs heat restored safely.
Call sooner if:
The furnace will not turn on at all
The furnace turns on but blows cool air
The system starts and stops quickly
The blower runs, but the burners do not ignite
Your home keeps getting colder
You are worried about safety
You have already tried the simple checks, and nothing changed
Get Heating Repair Help Now
When your home is cold, you need clear answers, not guesswork. YES! will look over the system, explain what is happening in straightforward terms, and take care around your heating equipment and living space while the work is being handled. We can help with heating service, furnace repair, emergency heating service, and furnace tune-ups for homes in Nevada and Utah.
Schedule heating service in Nevada or Utah, or call us directly at 844-216-9300 now.