Troubleshooting Common Furnace Problems: A Homeowner's Guide

Here are the First Things to Check When Your Furnace Stops Working

Before calling a furnace repair technician, perform these quick checks:

1. Inspect the Furnace Filter
   A dirty or clogged furnace filter can restrict airflow and trigger safety features, shutting down the system. Replace the filter and see if this resolves the issue.
2. Check the Power Supply
   Ensure the furnace power switch is in the "on" position and that the circuit breaker hasn’t tripped. Sometimes a simple reset is all that’s needed.
3. Test the Thermostat

• Replace batteries if your thermostat is battery-powered.
• Ensure the thermostat is set to “heat” and that the temperature is set higher than the current room temperature.

When to Call a Professional Furnace Technician

If the furnace still isn’t working after these steps, it’s time to contact a professional Langley furnace repair technician. Common issues requiring expert attention include:

• Faulty Igniter or Pilot Light: A worn igniter or extinguished pilot light can prevent the furnace from producing heat.
• Malfunctioning Gas Valve: Issues with the gas valve can disrupt the fuel supply.
• Blower Motor Problems: If the motor fails, warm air won’t circulate through your home.

Can a Dirty Furnace Filter Stop the Furnace?

Absolutely. A clogged furnace filter reduces airflow, which can cause the furnace to overheat. Modern systems often include safety mechanisms that shut the furnace down to prevent further damage.

Thermostat Troubles: More Than Just Batteries

While dead batteries are a common culprit, other thermostat issues can also affect your furnace:

• Miswiring: Incorrect wiring or loose connections can disrupt communication between the thermostat and the furnace.
• Faulty Sensors: Older thermostats may have sensors that no longer accurately read room temperature.
• Smart Thermostat Errors: Advanced models like Nest can sometimes cause issues, such as shutting down unexpectedly or misreading heating needs.

Our furnace maintenance technicians can diagnose these problems and recommend repair or replacement options, including installing reliable Wi-Fi-enabled thermostats like the Honeywell T6.

Resetting Your Furnace: A Quick Fix for Some Issues

If your furnace isn’t responding, try turning it off for 10 seconds and then back on. This can reset the system and resolve minor glitches. For example, condensation from cold venting may temporarily disrupt the furnace’s operation, but a reset often resolves this issue.

Preventative Measures to Avoid Future Breakdowns

Schedule Regular Maintenance
Annual inspections catch issues before they lead to breakdowns and you need a furnace replacement. Technicians clean, test, and adjust your system to ensure optimal performance.

Change Filters Regularly
Keep your furnace running efficiently by replacing filters every 1–3 months, depending on usage.



Monitor for Unusual Noises or Smells
Strange sounds or odors can indicate problems like loose components, electrical issues, or gas leaks. Address these promptly to avoid major repairs.

Troubleshooting Furnace Issues Made Simple with Willowbrook Plumbing & Heating

While some furnace issues are easy to fix, others require professional expertise. At Willowbrook Plumbing & Heating, we’re here to keep your home warm and safe. If your furnace isn’t working and you’ve tried the basic troubleshooting steps, give us a call. We’ll diagnose the issue and get your system back on track.