What to Check When Your Gas Furnace Isn’t Heating
Winter showed up fast this year in Michigan, even before Thanksgiving, catching a lot of home and business owners off guard. Unusually cold temperatures and early snowfall arrived before many people had a chance to prepare, putting furnaces to the test sooner than expected. When the weather turns this cold this quickly, even reliable gas furnaces can struggle if something small is off. That’s why Weinkauf Plumbing & Heating is here, to help people whose heat isn’t working quite right, or not working at all.
When the temperatures in Alpena and Oscoda drop, one of the more stressful things you can deal with is a gas furnace that suddenly stops working. Every winter, our team at Weinkauf Plumbing & Heating handles hundreds of calls from locals whose heat has failed. But, while many furnace issues do require professional repair, others are surprisingly easy to fix yourself.
If your gas furnace isn’t heating like it should, here are a few things to check before you call us for service.
1. Change That Air Filter
A clogged or dirty furnace filter is one of the most common causes of poor heating performance or complete furnace shutdown. If your furnace can’t pull in enough air, it can overheat and shut off automatically as a safety precaution.
That clogged air filter in your furnace could be full of more than just dust. Over time, it collects pet hair, pollen, mold spores, lint, and even tiny particles of insulation or construction debris. In some cases, bacteria and allergens can build up in the filter, making your indoor air feel stale or irritating your allergies. A dirty filter doesn’t just block airflow, it can lower your home’s air quality while forcing your furnace to work harder than it should.
What to do:
- Check your filter monthly during the winter.
- Replace it if it looks dirty or clogged.
- Set a reminder on your phone or your calendar so you don’t forget.
A clean filter helps your furnace run more efficiently and extends its lifespan.
2. Make Sure the Thermostat Has Power
If your furnace isn’t turning on at all, the problem could be as simple as dead thermostat batteries. Many digital thermostats require AA or AAA batteries to operate, and they don’t always warn you before failing.
Also check:
- That the thermostat is set to HEAT
- The temperature is set higher than the current room temp
- The circuit breaker hasn’t tripped
3. Check Your Propane Tank
For customers outside city limits, propane-powered furnaces are common, and so is running out of fuel in the middle of a cold snap. Before calling your HVAC technician, check your propane tank’s gauge. Even if it’s not empty, if you’re below 20%, it’s time to schedule a refill.
4. Look for Blocked Vents Inside and Out
Sometimes the problem isn’t with the furnace itself, it’s the airflow in and out of your home. If vents are blocked, your system can overheat or shut down early. Check:
- Are floor or wall vents blocked by rugs, furniture, or toys?
- Is the area around your furnace clear? (Keep it at least 3 to 6 feet clear.)
- Are the furnace’s exterior intake/exhaust pipes blocked by snow, ice, or leaves?
Blocked exterior vents are a common cause of furnace trouble in winter, especially after a heavy snow. Your furnace needs clear intake and exhaust vents to operate safely and efficiently. If snow, ice, leaves, or even animal nests block these openings, it can trigger your system to shut down automatically to prevent dangerous buildup of combustion gases like carbon monoxide.
Regularly checking and clearing these vents can help prevent unexpected breakdowns and keep your home safe and warm.
5. Don’t Ignore Short Cycling or Strange Noises
If your furnace is turning on and off rapidly or making new clunking, clicking, or squealing sounds, don’t wait to call us. These are early signs of a mechanical problem.
Short cycling can lead to:
- Excessive wear on parts
- Incomplete heating cycles
- Higher utility bills
- Risk of long-term furnace damage
When to Call Weinkauf Plumbing & Heating
If you’ve tried the checklist above and your furnace still isn’t heating properly, it’s time to call the pros. Our team can help with:
- Igniter or flame sensor problems
- Malfunctioning burners or limit switches
- Cracked heat exchangers
- Gas line issues
- Diagnosing thermostat wiring faults
We service gas furnaces of all makes and models throughout Alpena, Oscoda, and surrounding areas. And if your heat goes out in the middle of the night, we offer emergency service when you need it most.
Keep Your Winter Worry-Free
If your gas furnace is not heating, start with this checklist, and don’t wait until your home or business is freezing. You do not need frozen pipes on top of a malfunctioning furnace. Routine maintenance and early attention to small issues can help you avoid a costly breakdown when temperatures drop below zero.
Contact Weinkauf Plumbing & Heating or call us directly at (989) 354-5427. We’ll help you keep your home or business safe, warm, and comfortable all winter long.



















