Why Is My Heater Not Working? Common Causes & Solutions

At Above All Heating and Air, we understand the frustration of a heater that does not work, especially during the colder months. Whether your system is blowing cold air, making strange noises, or not turning on at all, we’re here to help. Our expert technicians have compiled the most common reasons for heating system failures and how to fix them.

Common Reasons Your Heater Isn’t Working

Thermostat Issues: The First Thing to Check

Before assuming the worst, start with the thermostat. Sometimes, a simple setting adjustment can get your heater back up and running.

• Check the Power: Make sure your thermostat has power. If it runs on batteries, replace them.
• Set to Heat Mode: It may seem obvious, but ensuring it’s set to “heat” and not “cool” can save you unnecessary worry.
• Adjust the Temperature: Set the thermostat at least five degrees higher than the current room temperature to see if the system activates.

If your thermostat isn’t responding, it may need recalibration or replacement.

Tripped Circuit Breaker or Blown Fuse

Your heating system requires electricity to function. If the circuit breaker connected to your furnace has tripped, your heater won’t work.

• Locate the electrical panel and check if the furnace switch has flipped to the “off” position.
• If you find a tripped breaker, reset it by switching it off and then back on.
• If the breaker trips repeatedly, this could indicate an electrical issue requiring professional attention.

Dirty or Clogged Air Filters

A clogged air filter restricts airflow, causing your heater to overheat and shut down as a safety precaution.

• Inspect your filter and replace it if it’s dirty.
• We recommend changing filters every 1–3 months, depending on usage and household conditions.

Not only does this improve heating efficiency, but it also enhances indoor air quality.

Pilot Light or Ignition Problems

Gas furnaces rely on a pilot light or an electronic ignition system to start. If these components fail, the furnace won’t heat your home.

• Pilot Light Out: If you have an older system with a pilot light, check if it has gone out. Relight it according to the manufacturer’s instructions.
• Ignition Failure: Modern furnaces use electronic ignition, which can fail due to wear and tear. This often requires professional servicing.

Gas Supply Issues

If you have a gas furnace, ensure the gas valve is open. If your furnace isn’t getting gas, your heater will not be working.

• If you smell gas, do not attempt to light the furnace. Evacuate immediately and call your gas provider or emergency services.
• If the gas valve is shut off, turn it on and try starting the furnace again.

Blocked or Closed Vents

Blocked vents can disrupt airflow, causing your system to overheat and shut down.

• Check all vents and registers to ensure they’re open and unobstructed.
• Move furniture, rugs, or curtains away from vents to allow proper airflow.

Frozen or Malfunctioning Heat Pump

If you have a heat pump, extreme cold can cause it to freeze up.

• Try switching to “Emergency Heat” mode to see if the backup heating element works.
• If the heat pump is covered in ice, it may need to go through a defrost cycle or require professional attention.

When to Call a Professional

While some heating issues can be fixed with simple troubleshooting, others require expert repair. You searched for why is my heater not working, which led you here. Call Above All Heating and Air if:

• Your heater still won’t turn on after checking power, filters, and settings.
• You hear loud or unusual noises from the system.
• There is a burning smell or signs of overheating.
• Your heating system is short cycling (turning on and off frequently).
• Your energy bills have spiked suddenly.

Our licensed HVAC technicians are ready to diagnose and repair your heating system to restore warmth and comfort to your home.

Preventative Maintenance to Avoid Heating Issues

Regular maintenance is the key to keeping your heater running efficiently and preventing unexpected breakdowns. Here’s what we recommend:

• Annual HVAC Inspections: Schedule a professional tune-up before winter.
• Filter Replacements: Change your air filter regularly.
• Thermostat Calibration: Ensure your thermostat is working accurately.
• Ductwork Inspection: Check for leaks or blockages in air ducts.
• Lubricate Moving Parts: Keep components running smoothly.

A well-maintained heating system lasts longer, runs more efficiently, and saves you money on repairs and energy bills.

Heater Now Working FAQs

Why is my heater blowing cold air?
This could be due to thermostat settings, dirty filters, or ignition issues. If it persists, contact a professional.

Why won’t my furnace stay on?
Short cycling is often caused by a clogged air filter, overheating, or a faulty flame sensor.

Can I fix my heater myself?
Basic troubleshooting is fine, but complex repairs, especially gas-related issues, should be left to HVAC professionals.

How much does heater repair cost?
Costs vary depending on the issue, but our team provides transparent pricing before any work begins.

Should I repair or replace my heater?
If your system is over 15 years old and requires frequent repairs, replacement may be the best option for efficiency and cost savings.

What brands of heating systems do you service?
We service all major brands, including Carrier, Trane, Lennox, Goodman, and more.

Trust Above All Heating and Air for Reliable Heater Repair

A malfunctioning heater can be more than just an inconvenience—it can be a safety hazard. At Above All Heating and Air, we provide fast, reliable, and affordable heating repair services to keep your home comfortable.

If your heater isn’t working, don’t wait—contact us today for expert HVAC service!