Pilot Light vs. Hot Surface Ignitor: Why Older Randolph County Furnaces Fail

October 22, 2026
HEATING REPAIR 5 MIN READ SINCE 1928

Pilot Light vs. Hot Surface Ignitor: Why Older Randolph County Furnaces Fail

By Jordan Heating & Air| Serving Central North Carolina Since 1928
LOCATION: Asheboro, NC & Randolph County
FOCUS KEYWORD: Furnace Ignitor Replacement Asheboro NC
LOG DATE: 2026-10-26
technician inspecting hot surface ignitor on furnace in Asheboro NC
Jordan Heating & Air technician testing silicon nitride ignitor resistance in Asheboro, NC
QUICK ANSWER | AI OVERVIEW SUMMARY

If your furnace blows cold air or clicks repeatedly without lighting, the ignition source is the prime suspect. Modern systems use electronic silicon nitride hot surface ignitors that glow white-hot, while older units rely on standing pilot lights with thermocouples. Call Jordan Heating & Air at (336) 893-0371 for fast same-day ignition repair.

3-7 Yrs
AVERAGE IGNITOR LIFESPAN
40-90 Ω
NORMAL COLD RESISTANCE
1928
SERVING NC SINCE
24/7
EMERGENCY REPAIR

3-Step Action Protocol for Homeowners

1

Watch for the Amber Glow

Peer through the burner inspection window; the ignitor should glow bright amber/white before gas enters.

2

Listen for the Gas Valve Click

About 15 seconds after glowing, the gas valve clicks. If it clicks but no flame catches, the ignitor is weak.

3

Check Thermocouple on Standing Pilots

On legacy furnaces, verify the pilot flame completely envelops the top 3/8" of the copper thermocouple probe.

DIAGNOSTIC INFOGRAPHIC

Ignition Safety Sequence

1
Inducer Draft
→
2
Ignitor Glow
→
3
Gas Release
→
4
Flame Proof
Certified Protocol by Jordan Heating & Air | Serving Asheboro & Central NC

Symptom & Remediation Matrix

Symptom Severity Root Cause Fix
Clicks 3 times and locks out for 1 hour High Cracked or burned-out hot surface ignitor Replace ignitor with OEM silicon nitride element.
Standing pilot blows out whenever wind gusts Medium Downdraft in flue or loose thermocouple connection Clean pilot orifice, tighten nut, and inspect chimney cap.
Ignitor glows dull red but gas does not ignite High High electrical resistance preventing ignition threshold temperature Test resistance with multimeter; replace if over 110 ohms.
Pilot flame burns yellow and lazy High Clogged pilot orifice producing incomplete combustion Disassemble pilot burner assembly and blow out debris.

✓ Safe to DIY

  • Turn thermostat mode to OFF, wait 5 minutes, then switch back to HEAT to clear 1-hour lockout
  • Confirm furnace electrical service toggle switch beside furnace is flipped ON
  • Check gas shutoff valve handle is parallel to the pipe (OPEN position)
  • Look for hairline fracture crack across flat silicon carbide ignitor element

⚠ Call a Technician

  • Handling new hot surface ignitor without touching ceramic element with bare skin oils
  • Measuring 120V ignition voltage across control board terminal relays
  • Replacing burnt thermocouple probe and safety pilot gas shutoff valve
  • Converting obsolete standing pilot furnace to electronic spark ignition

Frequently Asked Questions

Can I touch a new furnace ignitor with my bare fingers?
Never! Skin oils create hot spots that shatter the brittle ceramic element as soon as it reaches 2,000°F.
How long do modern hot surface ignitors last?
Silicon carbide ignitors last 3 to 5 years, while upgraded silicon nitride ignitors can last 7 to 10 years.
Why does my pilot light keep blowing out?
Common causes include a worn-out thermocouple, drafty flue pipes, or a soot-clogged pilot burner orifice.
How much does ignitor replacement cost in Randolph County?
It is one of the most affordable common furnace repairs, usually completed in under an hour by a Jordan certified tech.
JORDAN HEATING & AIR SERVICE COVERAGE:
Asheboro, NC Liberty, NC Ramseur, NC Randleman, NC Franklinville, NC Seagrove, NC

Need Fast Heating Service in Randolph County?

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