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Heating Troubleshooting

Why Is My Heater Not Working? Troubleshooting Guide

Updated January 2026 • 6 min read

Texas cold snaps don't give much warning. When your heater stops working, here's what to check before calling for service—and when you definitely need professional help.

Things You Can Check Yourself

1. Thermostat Settings

This sounds obvious, but check that your thermostat is:

  • Set to "HEAT" mode (not "COOL" or "OFF")
  • Set higher than current room temperature
  • Has working batteries (if battery-powered)

2. Air Filter

A clogged filter restricts airflow and can cause your heater to overheat and shut off. Check your filter and replace if dirty. This is the #1 preventable cause of heating problems.

3. Circuit Breaker

Check your electrical panel. Your furnace breaker may have tripped. If it trips again after resetting, you have an electrical issue that needs professional diagnosis.

4. Gas Supply (Gas Furnaces)

Make sure your gas valve is in the "ON" position. Check that other gas appliances are working. If you smell gas, leave immediately and call your gas company.

Problems That Need a Professional

Call for Service If:

  • Pilot light won't stay lit - Could indicate thermocouple or gas valve issues
  • Furnace runs but no heat - Blower motor, igniter, or flame sensor problems
  • Furnace cycles on and off quickly - Often a limit switch or airflow issue
  • Strange noises - Banging, squealing, or grinding sounds
  • Yellow or flickering flame - Possible combustion problem
  • Burning smell - Could be electrical or dust burning off (if first use of season)

Heat Pumps: Special Considerations

If you have a heat pump (common in Texas), it works differently than a furnace:

  • Heat pumps blow cooler air than furnaces—this is normal
  • In very cold weather (below 35°F), efficiency drops and backup heat may kick in
  • Ice on outdoor unit is normal during defrost cycles, but constant ice indicates a problem

When to Call for Emergency Service

Some situations require immediate attention:

  • Gas smell: Leave the house and call your gas company first
  • Carbon monoxide detector alarm: Leave immediately, call 911
  • No heat with vulnerable family members: Young children, elderly, or those with health conditions

Heater Not Working?

We diagnose the problem, document it with photos, and explain your options honestly.

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