Furnace Not Turning On? Troubleshooting Guide for Bucks County Homes
Summary: Furnace won't turn on? Safe checks in order: thermostat settings and batteries, breaker and furnace switch, clogged filter, igniter and flame sensor. Symptom-to-cause table, typical repair costs, and when to request professional diagnosis.
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Furnace Won't Start: Common Causes and Repair Costs
| Symptom | Possible cause |
|---|---|
| Nothing happens at all | Thermostat, breaker, or furnace switch |
| Clicks but never ignites | Ignition component or control |
| Ignites then shuts off | Flame-sensing, combustion, or control issue |
| Hums but no airflow | Blower or control issue |
The trip charge is $99.99, and diagnosis is a separate $149.99 charge. Together, the trip and diagnosis charges total $249.98 before any repair work. LegendAir provides scheduled appointments subject to availability, not emergency or last-minute service. Round-the-clock service is not offered.
Start with safe controls and power checks
Confirm thermostat heat mode and set point, replace thermostat batteries if applicable, inspect the filter, and check the labeled furnace switch and breaker once. Do not bypass switches or open combustion and electrical compartments.
Stop immediately for combustion warnings
Leave for a gas odor or carbon-monoxide alarm. Turn the furnace off for smoke, soot, a burning electrical smell, repeated breaker trips, or unusual flame and venting concerns, then request qualified help.
Error codes guide diagnosis but do not replace it
Record the displayed code without resetting the system repeatedly. The technician should test the indicated system and identify the underlying fault before recommending parts.
Authoritative Sources
Need diagnosis? Call (215) 317-6099 or book service. Planning an installation or replacement? Request a free project estimate.
Frequently Asked Questions
- Why is my furnace not turning on?
- Common causes include a thermostat setting or dead batteries, a tripped breaker or switched-off furnace power switch, a clogged filter, a failed hot-surface igniter, or a dirty flame sensor. LegendAir provides scheduled appointments subject to availability, not emergency or last-minute service. Round-the-clock service is not offered.
- How much does it cost to fix a furnace that won't start?
- The trip charge is $99.99, and diagnosis is a separate $149.99 charge. Together, the trip and diagnosis charges total $249.98 before any repair work. Repair pricing depends on the diagnosed part, equipment, access, and labor, and is provided in writing before approved work begins.