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Why Won’t My Furnace Turn On?

Home | Blog | Published on December 11th, 2023
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During the winter, there are few frustrations more annoying and uncomfortable than a furnace that won’t turn. If you’ve had your furnace maintained annually during the fall, you likely won’t run into a problem like this—but there’s never any guarantee of a perfect furnace performance. 

If you’re currently facing a furnace not heating in Clovis, CA, you can call our team to see what repairs it may need. In some cases, you may only need to do a bit of troubleshooting to correct the problem. Below, we’ll look at reasons for an obstinate furnace, what you can do about it, and when you need to contact us. 

Troubleshooting Solutions for Common Issues

Check the Thermostat

Do a quick check-in with the thermostat to ensure you have it set correctly and that someone else in your house hasn’t made adjustments that might cause the furnace to fail to turn on when necessary. Maybe an older program got activated by mistake. 

Inspect the Power Source

Is the furnace actually on? There’s a switch near the furnace used as a breaker that might be shut off and cutting off its power supply. Also check the electrical panel for your home to see if any breaker has tripped. Yes, this applies to gas furnaces as well. 

Examine the Air Filter

A clogged air filter in a furnace can cause it to come to a halt, overloading the blower and tripping a circuit breaker or overheating and making the limit switch shut the furnace off. This filter will clog up after one to three months and needs to be replaced. Put in a new filter if your furnace won’t turn on and see if this solves the problem, and remember that regular maintenance and routine maintenance can improve efficiency and extend the life of the equipment.

Scheduled tune-ups and inspections, including annual AC maintenance, can catch small problems early, help prevent costly breakdowns, improve performance, and extend the system’s lifespan.

Check for Blocked Vents and Ducts

Tour the rooms to see if there are any room vents that have become blocked with furniture, rugs, or anything else that might have been moved. Blocked ducts can cause the furnace to shut down.

Problems That Need the Pros

Malfunctioning Ignition System

An electronic ignition failure will prevent the furnace from sending gas to the burners as a safety precaution. You’ll need professionals to replace the igniter. In Fresno, CA, ignition problems should be handled by licensed technicians with California C-20 licensing, bonding, and liability insurance, and local experience matters because a local HVAC company serving Fresno and the wider Central Valley understands how the area’s extreme summer temperatures and poor air quality can put added strain on systems, so homeowners and business clients rely on trusted HVAC services and reliable AC services when expertise in diagnosing ignition-related heating and air conditioning repair issues is important. NATE Certification is the industry gold standard for competency in HVAC services. A typical diagnostic-and-fix visit usually takes 1 to 3 hours, and most air conditioner or AC repair calls can be completed in one visit when parts are available for the needed service by a company that specializes in reliable air conditioning repair as well as heating and air conditioning repair.

Faulty Thermostat or Wiring

Incorrect settings on the thermostat are one thing. It’s quite another when the thermostat is reading incorrect temperatures or has bad wiring that isn’t connecting to the furnace. Burning, chemical, or musty odors can also point to wiring issues or mold and should be inspected by a professional. Customers should expect honest recommendations focused on needed repairs, transparent pricing, and clear communication, with the office helping coordinate updates and scheduling; if you notice these issues, you can also request service right away.

Issues with the Blower Motor

A faulty blower motor can lead to the furnace overheating, and weak airflow may mean the blower is not moving air efficiently, which will trigger the limit switch that shuts the whole unit off. The blower assembly is a powerful part of the HVAC system, and only a trained tech should handle repair it.

Gas Flow Problems

There may be blockage in the gas line, dirt on the burners, or even a gas leak. You must not attempt to do any work on a gas line yourself because of possible safety issues. 

Failing Furnace

Finally, you may be facing an aging furnace that can no longer do its job effectively, and common heating-repair signs include unusual noises, inconsistent heating, and higher energy bills, along with sudden increases in power usage without changes to daily habits or unusual mechanical noises such as loud clanking, grinding, or squealing, which can point to severe efficiency loss or serious HVAC decline; if an air conditioning system is less than 10 years old and the issue is minor, air conditioning repair usually makes sense, but when a unit is over 12 years old, uses outdated refrigerant, and breaks down often, replacement may be the more cost-effective choice, especially when heating installation or new installations are the better long-term fit, with american standard as a reliable option and goodman as an affordable choice. Proper system placement may also involve areas such as the attic. We may also offer financing to help homeowners save on major replacements or installations and improve long-term savings. Pooling water or frozen coils around a unit require immediate professional attention. In this case, the only repair is to have professionals handle the replacement and installation.

Regular heating maintenance can extend equipment life and help avoid costly repairs. Maintenance plans help protect home comfort and help keep the home comfortable summer long.

Furnace and heat pump heating repair is essential for maintaining indoor comfort with reliable service and reliable warmth during winter months, and our operated team also provides business cool solutions for commercial settings.

Look to Purl’s Sheet Metal & Air Conditioning for all your heating needs! Uncompromised Quality & Customer Service Since 1952. 

Serving the Madera & Fresno Areas