When the temperatures drop, the last thing you want is a furnace that’s not doing its job. A malfunctioning furnace can leave your home chilly and uncomfortable, but some common issues can often be resolved with a little troubleshooting. Here’s a guide from Expert HVAC to help you diagnose and address common furnace problems—and when it’s time to call the professionals.
Check Your Thermostat
The Problem:
Your furnace isn’t turning on or is blowing cool air.
The Solution:
Start by checking your thermostat. Ensure it’s set to “heat” and that the temperature is set higher than the current room temperature. If it’s battery-operated, try replacing the batteries. For programmable thermostats, double-check your settings to make sure the schedule is correct.
Replace or Clean the Furnace Filter
The Problem:
The furnace is running but not heating effectively, or airflow is weak.
The Solution:
A clogged or dirty air filter can block airflow, making it difficult for your furnace to heat your home properly. Check your filter and replace it if it’s dirty—this should be done every one to three months, especially during heavy usage periods.
Inspect the Pilot Light or Ignition System
The Problem:
The furnace is blowing cold air or not turning on.
The Solution:
For older furnaces with a pilot light, ensure the flame is lit and burning blue. If it’s out, relight it carefully following your furnace manual’s instructions. For newer models with electronic ignitions, issues could stem from a faulty ignition switch or sensor, which may require professional repair.
Check the Circuit Breaker
The Problem:
The furnace isn’t powering on at all.
The Solution:
Your furnace might not be receiving power. Check your home’s circuit breaker panel to see if the switch for your furnace has tripped. If it has, reset it. If the breaker trips again, it could indicate a deeper electrical issue, which requires professional attention.
Look for Blocked Vents and Registers
The Problem:
Certain rooms in your home are colder than others.
The Solution:
Check that all vents and registers are open and not obstructed by furniture or debris. Blocked airflow can cause uneven heating and put unnecessary strain on your furnace.
Examine the Blower Motor
The Problem:
The furnace is running, but there’s little or no airflow.
The Solution:
The blower motor, responsible for circulating warm air throughout your home, might be dirty or malfunctioning. While some cleaning can be done with a vacuum, a faulty motor or belt will require professional repair or replacement.
Test for Unusual Noises or Smells
The Problem:
You hear banging, rattling, or squealing noises, or smell something burning.
The Solution:
Unusual sounds or smells can indicate mechanical problems, such as a loose part, worn belt, or overheating. Turn off your furnace and contact a professional if these issues persist.
Inspect the Flame Sensor
The Problem:
The furnace turns on but shuts off quickly.
The Solution:
The flame sensor detects whether your furnace is properly igniting. If it’s dirty or faulty, your furnace might shut off as a safety precaution. Cleaning or replacing the flame sensor is best handled by a professional technician.
Check Your Home’s Airflow
The Problem:
The furnace is running but struggling to maintain a consistent temperature.
The Solution:
Your furnace might be overworking due to poor insulation or drafty windows. Seal gaps around doors and windows and ensure your home is properly insulated to reduce strain on your furnace.
When to Call the Professionals
While these troubleshooting tips can help resolve minor furnace problems, some issues require professional expertise. If you’ve tried these solutions and your furnace is still not heating properly, it’s time to call in the experts. At Expert HVAC Services, we specialize in fast, reliable furnace repairs to keep your home warm and comfortable.
Our experienced technicians are ready to diagnose and fix any furnace issue, whether it’s a faulty ignition, blower motor, or something more complex. Don’t let the cold take over—contact us today to schedule a repair or learn more about our services.
