.avif)
When your heater is not working, it can be stressful—especially during cold weather. Homeowners often ask, “Why won’t my furnace turn on?” or “Why is my furnace not heating properly?” The truth is, furnace issues can come from something as simple as a dirty filter or as serious as a broken component. Knowing the common causes and basic furnace troubleshooting steps can help you restore comfort faster—or know when it’s time to call in the experts.
If your heating system isn’t working effectively, IRBIS Air, Plumbing & Electrical can help. We’re a trusted HVAC team, ready to restore your comfort quickly and efficiently. Call us at (669) 280-7399 or request service online.
Why Is My Heater Not Working?
If your heater is not working, it doesn’t always mean your system has failed. In many cases, the problem is caused by minor issues that can be fixed quickly. Some of the most common reasons include:
- Thermostat problems. Incorrect settings, dead batteries, or a faulty thermostat can prevent your furnace from starting.
- Dirty or clogged air filters. A blocked filter restricts airflow, causing the furnace to overheat or shut down.
- Power supply issues. Tripped breakers, loose wiring, or a switched-off power supply can make it seem like your furnace won’t turn on.
- Gas supply problems. A closed gas valve or issues with the gas line will stop your furnace from heating.
If these simple checks don’t solve the issue, you may be dealing with a broken furnace that requires professional service. Our team at IRBIS specializes in expert furnace repair, helping you get your heat back on quickly and safely.
Furnace Won’t Turn On: Quick Checks You Can Do
If your furnace won’t turn on or keeps shutting down, try these quick troubleshooting steps before calling for repair:
- Check the thermostat – Make sure it’s set to Heat and the temperature is higher than the current room temperature. Replace the batteries if needed.
- Inspect the power switch and breaker – Your furnace has a dedicated switch (like a light switch) near the unit. Also, check the breaker box to ensure it hasn’t tripped.
- Look at the air filter – A dirty filter can block airflow, causing the system to shut off. Replace it if it looks clogged.
- Examine the pilot light or igniter – Older furnaces use a pilot light that can go out; newer models have electronic igniters that may fail.
- Check the gas supply – Ensure the gas valve to the furnace is open. If you suspect a gas issue, call a professional immediately.
These simple steps solve many “furnace not turning on” issues. But if your system still won’t start, it’s time to schedule a professional furnace repair.
Furnace Not Heating Properly
When your furnace is not heating properly, it usually comes down to a few common issues. Sometimes the thermostat isn’t communicating with the system, so even though it’s set to “heat,” the furnace never kicks in. In other cases, the furnace may start but shut down quickly because of poor airflow or safety sensors detecting a problem. A lack of heat can also point to ignition failures, where the pilot light or electronic igniter isn’t working as it should. Even ductwork problems, like leaks or blockages, can make it feel like the furnace isn’t producing enough warmth.
Understanding what’s behind the problem is the first step—addressing it quickly helps prevent a complete furnace breakdown and keeps your home comfortable through the season.
How to Troubleshoot a Furnace
If your furnace won’t turn on or the heater is not working as expected, there are a few simple things you can check before calling for repair. Make sure the thermostat is set to “heat” and the temperature is higher than the current room temperature. Look at the circuit breaker and furnace power switch to confirm the system has power. A dirty air filter is another common reason for poor performance—replacing it often restores proper airflow. Finally, check the pilot light or igniter; if it isn’t functioning, the furnace won’t produce heat.
Broken Furnace: When to Call a Professional
A broken furnace can show itself in many ways—loud noises, unpleasant odors, or frequent short cycling. Continuing to run the system in this condition can damage critical parts and may even create fire or carbon monoxide risks.
Professional furnace repair is the safest solution. Our technicians at IRBIS Air, Plumbing & Electrical can identify the root cause and restore reliable heat before further damage occurs.
How to Prevent Future Problems
The best way to avoid a furnace not working in the middle of winter is with preventive care. Regular maintenance keeps small issues from turning into major repairs and ensures your system runs at peak efficiency. Homeowners can help by:
- Replacing or cleaning air filters every 1–3 months
- Checking thermostat settings and replacing batteries when needed
- Keeping vents and registers clear of dust and obstructions
Beyond these simple tasks, scheduling professional furnace maintenance once or twice a year is the most effective step. During a tune-up, a technician will inspect key components, test safety controls, and clean the system thoroughly. This not only prevents unexpected breakdowns but also extends the life of your furnace and reduces energy bills.
Keep Your Home Warm with Professional Furnace Repair
Dealing with a furnace not working can be stressful, but you don’t have to face it alone. Whether your furnace won’t turn on, isn’t heating properly, or has completely broken down, IRBIS Air, Plumbing & Electrical delivers fast, expert solutions.
Call us today at (669) 280-7399 or request furnace repair online to restore your comfort in San Jose and the surrounding areas.
