Few issues are more frustrating than a furnace that won’t ignite on a cold Katy night. A homeowner in Elyson called us after hearing their furnace click repeatedly with no heat. Our technician tested the hot surface igniter, confirmed it was cracked, and replaced it on the spot. After cleaning the flame sensor and verifying gas pressure, the system lit reliably and reached temperature quickly.
Across Katy, Cypress, and the Northwest Houston suburbs, we regularly fix ignition issues ranging from weak igniters to dirty flame sensors, incorrect gas pressure, and control board faults. TemperaturePro Katy-Cypress provides accurate diagnostics, code-compliant repairs, and transparent pricing—so your heat comes back quickly and safely.
Service Details
Common ignition issues we diagnose and repair:
- Hot surface igniter failure – cracked or weakened igniters that glow dimly or not at all; correct resistance testing and proper replacement.
- Spark ignition problems – weak or misdirected spark, cracked spark rod, improper gap or grounding.
- Flame sensor faults – dirty or mispositioned flame sensors causing flame failure lockouts; cleaning and alignment restore proof of flame.
- Gas delivery and pressure – gas valve not opening, incorrect manifold pressure, or regulator issues preventing proper ignition.
- Control board and safety switches – faulty relays, rollout or high-limit trips, pressure switch failures, or wiring issues interrupting ignition cycles.
- Combustion air and venting – blocked intake or exhaust on high-efficiency units, poor draft, or condensate issues that disrupt the ignition sequence.
Our diagnostic process:
- Verify the thermostat call for heat and control board fault codes.
- Test igniter resistance and voltage; inspect for cracks or hot spots.
- Clean and test the flame sensor microamp signal; reposition if needed.
- Measure manifold gas pressure with a manometer; check burner alignment.
- Confirm draft and pressure switch operation and venting integrity.
- Perform safety checks : CO test and combustion analysis where appropriate.
Katy-specific considerations:
- Attic installs can stress ignition components due to heat and humidity cycles.
- Dust and summer renovation debris foul burners and sensors by winter.
- Long vent runs and improper terminations can cause intermittent ignition lockouts.
Related resources: our Furnace Repair Services overview, Heat Exchanger Repair, and Is Old Furnace Repair Worth It?
Trusted Local Experts
We help homeowners in Katy, Cypress, Elyson, Grand Lakes, and Nottingham Country get their heat back safely. One recent call in Cane Island involved a furnace that lit briefly then shut down. Our testing showed the flame sensor signal was weak due to a dirty burner assembly and misaligned sensor. After cleaning, realigning, and verifying microamps, the furnace ran steadily without lockouts.
For national best practices on safe heating, see the U.S. Department of Energy’s guidance on Furnaces and Boilers.
What to Expect
- Rapid arrival and thorough ignition diagnostics.
- Safety checks included (CO, combustion, draft).
- Clear repair plan with upfront pricing.
- Proper part replacements and calibration.
- Post-repair verification you can see (readings and photos where applicable).
Get Furnace Help Today
If your furnace won’t ignite, keeps cycling, or shuts down after lighting, call 281-607-5884 for expert service from TemperaturePro Katy-Cypress. We serve Katy, Cypress, Elyson, Cinco Ranch, Grand Lakes, Nottingham Country, and surrounding Harris County. Prefer online booking? Use Schedule Service Online.
Frequently Asked Questions
Why does my furnace click but not ignite?
The igniter may be weak or cracked, the gas valve may not be opening, or the control sequence is interrupted by a safety switch. Diagnostics identify the specific cause.
Why does my furnace light, then shut off?
The flame sensor may not be proving flame due to dirt or misalignment, or there may be a draft or pressure switch issue. Cleaning and proper positioning usually fix it.
How do I know if my igniter is bad?
A cracked appearance, low glow, or out-of-range resistance reading indicates failure. We test and replace with the correct part and rating.
Can low gas pressure cause ignition failure?
Yes. Incorrect manifold pressure or regulator problems can prevent reliable ignition. We measure and calibrate per manufacturer specs.
Should I repair or replace for ignition problems?
Most ignition issues are repairable at modest cost. If the furnace is older with multiple failures, we’ll also provide replacement options for comparison.
Comfort You Can Count On
Call TemperaturePro Katy-Cypress at (281) 607-5884 or request service online for fast, affordable furnace and HVAC repair across Katy, Cypress, and Greater Houston.
