Start-Up Observation
We watch the ignition sequence.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
Workmanship Guaranteed in York
What Ignitor And Sensor Repair Includes
A visit covers start-up observation, ignitor and sensor testing, repair and flame verification.
Ignitor Testing
We test ignitor resistance and glow.
Sensor Inspection And Cleaning
We inspect and clean the sensor.
Replacement If Needed
We replace failed parts.
Flame Verification
We confirm steady flame across cycles.
What The Ignitor And Flame Sensor Do
A furnace ignitor is the part that lights a gas furnace's burners, usually a hot surface ignitor that glows to light the gas. A flame sensor is a thin metal rod in the burner flame that confirms the flame is present. If the sensor does not detect flame within seconds, the control board closes the gas valve for safety.
Both parts live in a hot, dirty environment. The ignitor is fragile and can crack or weaken. The sensor collects a thin layer of carbon that blocks its signal. Furnace repair in York for these parts is common, and many gas furnace no-heat calls trace to one of them. Because the parts are small, the repair is often modest when the diagnosis is correct.
How We Repair Ignitors And Sensors
We test each part, then clean or replace as the test shows.
01
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
02
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
03
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
04
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Ignitor And Sensor Tools
Tools & Equipment
Digital multimeter
Tests ignitor resistance and sensor signal.
Microamp meter
Measures the flame sensor's signal to show whether it detects flame.
Sensor cleaning materials
Remove carbon from the sensor rod.
Visual burner inspection
Checks flame appearance and burner cleanliness.
Methods & Standards
Resistance testing
We measure the ignitor against expected values.
Signal testing
We measure the sensor's signal.
Repeat-cycle verification
We confirm steady flame across several cycles.
When To Call For Ignitor Or Sensor Repair
01
Your furnace lights for three seconds then shuts off, over and over.
What we do: We inspect and clean the flame sensor and verify flame.
→ Burners stay lit.
02
You hear the furnace click and nothing lights.
What we do: We test the ignitor and replace it if weak.
→ The furnace lights reliably.
03
The furnace worked fine last winter and will not start this fall.
What we do: We check for a cracked ignitor or fouled sensor.
→ Heat returns.
Ignitor And Sensor Calls In York
Ignitor and flame sensor problems often surface when a York furnace restarts after a summer of rest. Carbon on the sensor and a weakened ignitor are both invisible until the furnace is asked to light, which is usually the first cold night. A hot surface ignitor can also crack from thermal stress over many winters of heating cycles, particularly in older furnaces common in York County homes. We serve York and nearby areas and see these parts fail regularly. A quick start-up observation tells us a lot, since a glowing ignitor and a failed light points one way, while burners that light and drop out point another.
Neighborhoods We Serve
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York
York homes with older gas furnaces often need ignitor replacement after many seasons.
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Springettsbury Township
Springettsbury Township calls often involve sensors fouled after summer.
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West York Borough
West York Borough households call when burners light and drop out.
Local Conditions We Plan For
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Idle summer months
Carbon and dust can foul the sensor before the first cold start.
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Many heating cycles over years
Thermal stress can crack ignitors in older furnaces.
Flame drops out
Ignitor And Sensor Problems We Fix
These are the common failures.
Problem
The ignitor glows but the burners never light
The furnace cannot start and the house stays cold.
Our Fix
We test the ignitor and gas conditions and replace a weak ignitor.
Problem
The burners light and go out in seconds
The furnace cycles uselessly.
Our Fix
We clean or replace the flame sensor.
Problem
The ignitor does not glow at all
No ignition means no heat.
Our Fix
We test the ignitor and wiring and replace the failed part.
What Fixing These Parts Gives You
A working ignitor and sensor give a gas furnace reliable starts and steady flame.
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Reliable Lighting
A tested ignitor lights the burners on the first try.
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Steady Flame
A clean sensor keeps the furnace running instead of shutting off seconds after lighting.
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A Small Repair Done Right
Many no-heat calls come down to one of these parts, a modest repair when found early.
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Fewer Startup Failures
Replacing a weak ignitor before it fails avoids a cold-night breakdown.
What Affects Ignitor And Sensor Repair Cost
Ignitors and flame sensors are small parts, and the repair is usually modest. Cost depends on whether cleaning is enough or replacement is needed, and on the furnace model. We test first so you pay for what has failed.
What changes the price
01
Clean or replace
Cleaning a sensor costs less than replacing it.
02
Furnace model
Part cost varies by model.
03
Underlying cause
A recurring fouled sensor may need burner attention.
04
Urgency
A no-heat night is urgent.
Ignitor And Sensor Experience
These two parts cause a large share of gas furnace shutdowns, so we see their failure patterns often.
- Hot surface ignitors that crack, weaken or fail to reach lighting temperature.
- Flame sensors coated in carbon that cannot detect flame.
- Burner conditions that foul the sensor repeatedly.
- Control board behavior when flame is not proven.
- Safe handling of fragile ignitor parts.
Frequently Asked Questions
Real answers to the questions we hear most often from local homeowners and property managers.
How much does it cost to repair a furnace flame sensor?
A flame sensor is a small, low-cost part, and cleaning it is often a modest repair. Cost depends on whether the sensor needs only cleaning or replacement. We test first, then tell you what the repair involves. Call (717) 276-7978 with your symptoms.
How much does it cost to fix an igniter on a furnace?
Ignitors are small parts and replacement is generally a modest repair compared with motors or boards. The exact cost depends on the furnace model. We test the ignitor first so you only pay to replace it if it has failed.
What are the signs that my furnace flame sensor is bad?
The classic sign is burners that light and go out within a few seconds, repeating until the furnace locks out. A dirty sensor cannot detect flame, so the control board shuts off the gas. Cleaning or replacing it usually solves the problem.
Can I replace a flame sensor myself?
Some homeowners clean a flame sensor, but it involves shutting off power and gas to the furnace and handling parts safely. If you are not comfortable, call us. A wrong diagnosis can also waste a part, so testing first is worthwhile.
Related Services
Gas Furnace Repair
Ignitors and sensors are part of the full gas furnace start-up sequence.
View Gas Furnace RepairFurnace Not Heating
A failing ignitor or sensor is a common cause of a furnace that will not heat.
View Furnace Not HeatingFurnace Won't Turn On
An ignitor failure can look like a dead furnace.
View Furnace Won't Turn OnFurnace Inspection and Tune-Up
Seasonal service cleans sensors and checks ignitors before failure.
View Furnace Inspection and Tune-UpContact Furnace Repair York Pros
Call (717) 276-7978 to talk about your furnace. Tell us whether it is gas or electric and what you notice: no heat, cold air, noise or constant restarts. We serve York and nearby communities in York County, Pennsylvania.
Furnace Repair York Pros
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Phone
(717) 276-7978 -
Address
York, PA
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Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available