It clicks, it tries, it quits. Here is why.
Most no-heat calls start in the ignition system: a cracked igniter, a dirty flame sensor or a weak spark. We diagnose the start-up sequence and repair the part that fails.
- Tests: Igniter resistance, flame sensor signal, gas valve
- Parts: Igniters, flame sensors, pressure switches
What it is, and why it matters.
Modern furnaces light with a hot surface igniter or a spark and verify the flame with a sensor. If the igniter is cracked or weak, the burners never light. If the flame sensor is coated with residue, the furnace lights, loses the signal and shuts down after a few seconds, then tries again. The result is a furnace that clicks, glows and goes cold.
Nashville HVAC repairs furnace ignition systems across Middle Tennessee. We test the igniter's resistance, clean or replace flame sensors, check the gas valve and pressure switches and look for the underlying cause, such as a restricted vent or a dirty burner. A written price comes before any parts are installed.
Four things done right.
Sequence-based
We watch the start-up sequence and find the step that fails.
Small parts, careful tests
Resistance and signal tests show whether a part is truly weak.
Checks the cause
A dirty burner or restricted vent can wear out new parts, so we look beyond the part.
Full-cycle test
We confirm several complete heating cycles before leaving.
From first call to furnace ignition repair.
- 1
Watch the sequence
We run the furnace and note where start-up stops.
- 2
Test the parts
Igniter, sensor and valve tests identify the weak link.
- 3
Replace or clean
We clean the sensor or replace the failed part after you approve the price.
- 4
Cycle and confirm
We run complete cycles and check the burners and venting.
Furnace Ignition Repair across Middle Tennessee.
We do this work for homes and businesses from Nashville, Franklin and Murfreesboro to Gallatin, Hendersonville, Lebanon and Columbia.
Furnace Ignition Repair: common questions
Why does my furnace light and then go out?
Usually a dirty or weak flame sensor, which cannot confirm the flame. Cleaning or replacing it often fixes it, and we also check for what caused the buildup.
How long does an igniter last?
Hot surface igniters are fragile and wear out. Many last several years, but it varies. A failing igniter often glows dimly or cracks, and we can test it.
How do I get an estimate for furnace ignition repair?
Fill in the form or call or text 615-431-3789. Photos of the equipment and its label usually give us what we need, and we send a written price. Larger jobs start with a short visit.
Ready to talk about furnace ignition repair?
A short visit or a few photos, and a written price. A real person calls back promptly.