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Furnace Problems
What are the Most Common?

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What Are the Leading Standard Furnace Problems?

We have listed out the ten most common furnace problems and advice on how to repair and fix inevitable Malfunctions.

When the chilly fall and winter climate arrives, hundreds of people contact The Spengler furnace repair specialists to  troubleshoot their heating system. By understanding what the common furnace problems are, you can take proactive steps to limit them.

The Absence of Maintenance

You neglect to schedule yearly furnace maintenance and inspections that may prevent unforeseen problems and failures. These regular inspections can help the heater or furnace run more efficiently and dependably.

Dirty Filters

Dirty or obstructed air filters decrease airflow, causing a furnace to work harder to distribute air. In some cases, a dirty filter may cause permanent damage to your system.

Wear and Tear

Natural wear and tear can produce inefficiency which leads to high bills.

Ignition or Pilot control issues

A faulty ignition or pilot may make it challenging to heat a home or business space. Thermocouple issues, drafts or blockages in the appliance may occur in an unlit pilot light.

Problematic Thermostat

A broken thermostat can lead to difficulties with the fan or comfort levels.

No Heat

A furnace that is not heating may have issues with the thermostat setting, power to the furnace, or the pilot light.

Inadequate Heat

A clogged filter could be to blame, a furnace may not generate enough heat if the filter is the incorrect size for the space in your home.

Frequent Cycling

Cycling amid the “On” and “Off” modes may mean a dirty filter, abnormal airflow or a faulty thermostat.

Blower is always on

Blower problems may register a problem with the limit switch, that a professional at the Spengler Company may need to repair for you.

Noisy Furnace

Rumbling, squeaking, and noises aren’t normal. The noises may indicate a mechanical issue, airflow losses or an inoperable system.

Furnace Problems?
Tips & Advice for Repairs

Clogged Air Filters

Dirty air filters lead to a number of furnace problems. Replace or clean the filter once a month, according to the manufacturer’s instructions. A furnace repair professional at Spengler can explain to you how to replace your furnace.


If the thermostat seems as if your furnace doesn’t generate any heat, monitor the battery level in the thermostat. Simply replacing the battery for new batteries, may do the trick.

Blower Fan Keeps Running

Check the thermostat. The fan setting should be on, Auto. In the On setting, the fan will work continuously.

Insufficient Heat

Check the thermostat’s to make certain it’s on “Heat” mode. Then monitor the temperature to make certain it’s set to a temp that’s greater than the current temperature in that specific room.

Buying a New Thermostat

Be sure when you purchase the new thermostat it matches your furnace as for capability and capacity, or you may face inevitable problems.

Check the Circuit Breaker

If the heater stops working or the thermostat is blank, verify if the circuit breaker tripped or you blew a fuse.


If a draft creates problems with the pilot light, you will want to close the windows or doors in the area.


Each year, at the conclusion of the summer or beginning of fall, call Spengler your furnace repair specialist to examine and maintain the heater. Our professionals will get the unit ready for the imminent cool weather and fix issues that could produce breakdowns or expensive replacements during busy winter periods.

Replacing Your Furnace

If you want to replace your furnace, use Spengler’s furnace expertise to decide the right model and size for your home.

Ignition & Pilot Problems

As problems may occur from jammed components or damaged electrical components, leave ignition problems to the experts at Spengler. Call 618.206.0022 to schedule your appointment today.

Mechanical Problems

Unless you obtained training to fix furnaces, let professionals at Spengler Heating and Cooling handle problems associated with mechanical damage of your unit. Otherwise, you will void the warranty on the machine or inadvertently cause a bigger problem.

Gas & Propane tips

If you suspect problems with the gas feed or valve from a malfunction with the gas system, call a Spengler professional for help.