What to Do When a Furnace Won't Turn On
Understanding basic troubleshooting techniques can help address a failing heating system without unnecessary worry.
A furnace is essential for maintaining comfort during the winter. However, there are times when it fails, especially if it hasn't been used for an extended period. Understanding basic troubleshooting techniques can help address a failing heating system without unnecessary worry.
Common Issues That Might Occur
Thermostat Issues
Make sure the thermostat is set to heat. Newer electronic thermostats often display an error code if there is a problem. Check the display to identify any specific issues.
Dirty Filters
Clogged filters can significantly reduce a heating unit's efficiency. This problem can also damage the limit switch, which controls the blower.
Over-Cycling
If the furnace turns on more frequently than usual, this might lead to higher power bills. This issue often results from a problem with the thermostat or airflow.
Weak Pilot Light
A flickering pilot light could indicate excessive carbon monoxide. This component is crucial for the furnace's operation, and any irregularities should be addressed promptly.
Faulty Blower Belt
A high-pitched sound during operation often points to issues with the blower belt. This noise should be investigated to prevent further damage.
Worn-Out Ball Bearings
Ball bearings are critical for the motor's proper functioning. Over time, they can wear out, affecting the furnace's performance.
Non-Existent Airflow
A clogged blower could result in a lack of airflow. Several factors might cause this issue, but it's commonly due to obstructions in the system.
Unpleasant Sounds
Rattling or popping noises might indicate loose panels or issues with the ductwork.
How to Address Furnace Issues
Ensuring a functioning heating system during the holidays is crucial. Understanding how to troubleshoot the system can prevent significant issues. Here are some steps to consider:
Reset
Most furnaces have a reset button on the motor housing. Similar to many appliances, turning the device off and waiting for it to cool down before turning it on again can sometimes resolve the problem. Try this process twice if the issue persists.
Double-Check Thermostat Settings
The thermostat plays an important part in regulating room temperature. Reset it and set the fan to auto. Check if it runs continuously on all settings and replace batteries if needed.
Ensure Gas Supply
A gas furnace has a valve or gas cock within six feet of the unit. This valve might have been accidentally closed. If the handle is perpendicular to the pipe, open it by turning the handle. If the furnace still doesn't operate, a professional assessment is necessary.
Replace the Filter
A filter clogged with dust, hair, and debris can hinder system performance. Filters should be replaced every three months to maintain airflow and efficiency. If replacing the filter doesn't resolve the issue, a technician should inspect and clean the system.
Check the Ignition Sensor
The ignition sensor detects whether the furnace is burning gas by sensing temperature changes. If it fails to detect flames, it shuts down the unit. Cleaning the sensor can restore functionality:
Check error codes for potential severe issues.
Turn off the power and gas.
Remove the front panel to locate the sensor, and use a screwdriver to remove it.
Clean the ignitor's probe with sandpaper.
Reassemble the sensor and switch the system back on.
Verify Electrical Supply
Confirm that other electrical components in the home are functioning. If they aren't, there may be an electrical issue. Contact a service provider for assistance.
Consult a Professional HVAC Technician
While some solutions can be handled with minimal technical knowledge, it is advisable to consult a professional. A technician can accurately diagnose problems and determine whether repairs or a complete replacement are needed. This professional insight can save time and prevent costly mistakes from DIY attempts.
The Bottom Line
Prevention is better than cure, particularly for heating, ventilation, and air conditioning systems. Routine cleaning and maintenance are the best steps to ensure the furnace operates efficiently during winter. The cleaning process consists of replacing oil and air filters, scheduling a combustion chamber clean-up, inspecting the flue pipe, adjusting the burner, and polishing floor vents. Finding a reliable contractor to perform these tasks is essential for maintaining the system's longevity and performance.
At Forecast Heating, Cooling, and Refrigeration, our technicians have proudly met all the furnace installation and repair, furnace maintenance and tune-up, heat exchanger replacement, and furnace gas valve replacement needs. Call today at (702) 919-4546 to book a service.
