Pilot Light Problems: A Simple Guide

Why the Pilot Light Matters

The pilot light in your gas heater is a small flame that plays a big role. It’s responsible for igniting the main burner whenever your thermostat signals the need for warmth. In older gas heating systems across Australia, this mechanism is common, especially in homes with traditional ducted heating or older wall furnaces. While many modern systems use electronic ignition, millions of Australians still rely on pilot-light-equipped units.

If your gas heater pilot light won’t light or won’t stay lit, your heater won’t function, leaving your home cold and potentially exposing your family to hidden dangers. Worse, malfunctioning components may lead to carbon monoxide leaks, one of the most serious safety hazards in gas appliances.

Common Reasons Why the Pilot Light Won’t Light

Knowing the likely culprits can save time and reduce frustration. Below are the most frequent causes—and how to assess or address them.

Problem: Pilot Light Won’t Light

  • Tripped circuit breaker
    • DIY Solution: Check your home’s breaker box and reset the tripped circuit.
    • Call a Pro If: The breaker trips repeatedly.
  • Gas valve turned off
    • DIY Solution: Turn the gas valve to the “On” position and follow your heater’s relighting instructions.
    • Call a Pro If: The pilot still won’t light and other gas appliances don’t work either.
  • Clogged pilot light opening (orifice)
    • DIY Solution: Gently clean with a soft brush or use compressed air (ensure gas is off).
    • Call a Pro If: You’re not confident cleaning it or the blockage persists.
  • Ignition system malfunction
    • DIY Solution: Visually inspect for broken wires or loose connections (with gas and power off).
    • Call a Pro If: Any issue beyond a simple visual check.

Pilot Light Lights But Won’t Stay Lit

This can point to problems with components that control gas flow and flame detection.

Problem: Pilot Light Won’t Stay Lit

  • Dirty or bent thermocouple
    • DIY Solution: Clean gently with fine sandpaper and reposition (gas off).
    • Call a Pro If: The issue persists.
  • Drafts blowing out the flame
    • DIY Solution: Check for and seal window or door drafts.
    • Call a Pro If: Drafts originate from furnace venting or flue.
  • Kinked or blocked pilot tube
    • DIY Solution: Carefully inspect for kinks or blockages (gas off).
    • Call a Pro If: You’re unsure or the blockage is severe.
  • Malfunctioning gas regulator
    • DIY Solution: Check if other gas appliances are weak or not functioning.
    • Call a Pro If: More than one appliance is affected.
  • Exhaust vent or flue issues
    • DIY Solution: Visually inspect for blockages, nests, or debris.
    • Call a Pro If: Any sign of damage or obstruction.
  • Cracked heat exchanger (indirect cause)
    • DIY Solution: None.
    • Call a Pro If: Pilot won’t stay lit alongside symptoms like strange noises or odours.

General Safety Concerns with Gas Heating

Gas appliances are efficient but come with real risks if not maintained.

Red Flag Symptoms to Watch For:

  • Smell of gas
    • Action: Do NOT attempt DIY. Turn off the main gas valve and call your gas provider or emergency services immediately.
  • Yellow or orange pilot flame
    • Indicates incomplete combustion and CO production.
    • Action: Call a licensed gas fitter immediately.
  • Discomfort with any troubleshooting step
    • Action: Leave it to a pro.

DIY Troubleshooting: Step-by-Step (For Confident Homeowners)

IMPORTANT: Only proceed if you’re comfortable and know where your gas shut-off valve is.

DIY Steps

  1. Turn off the gas supply.
  2. Wait 5+ minutes to allow any residual gas to dissipate.
  3. Clean the pilot orifice and thermocouple gently.
  4. Check for and eliminate drafts.
  5. Relight the pilot following your manufacturer’s guide.
  6. Observe the flame—it should be blue with a faint yellow tip.
  7. Call a technician if anything feels off.

How to Prevent Pilot Light Problems

Regular maintenance is key to prevention. Here’s what you can do:

  • Schedule servicing annually.
    • In Victoria, Energy Safe Victoria mandates servicing every 2 years; annually is best for safety.
  • Replace filters every 1–3 months.
  • Keep the heater area clean and clear of flammables.
  • Install carbon monoxide alarms near sleeping areas and test monthly.

Safety Tip: Never Leave Gas Heater On Overnight

One key rule: don’t leave gas heater overnight—even if your pilot light seems stable. The risks of CO poisoning, fire hazards, and malfunctions multiply when appliances run unattended during sleep.

Dangers of Overnight Use:

  • Carbon monoxide buildup
  • Reduced ability to respond in emergencies
  • Fire risk due to overheating or surrounding clutter

To learn more about overnight use risks, see our guide on “Is It Safe to Leave Your Gas Heater On Overnight?”

When to Call a Licensed Gas Fitter

Always involve a pro if you experience any of the following:

  • Repeated pilot light failure
  • Any gas odours
  • Discoloured flame (yellow/orange)
  • Heater making strange sounds
  • Inconsistent or low flame pressure
  • Suspected flue or venting issue

Need help? Book a licensed technician today at Rite Price Heating & Cooling

Rebates You Might Be Eligible For

SA REPS (South Australia)

  • Covers:
    • Upgrades to energy-efficient gas heaters
    • Some service work when bundled with new installations

VIC VEU (Victoria Energy Upgrades)

  • Covers:
    • High-efficiency gas heater replacements
    • Part of a broader emissions reduction plan
    • Servicing only covered if linked to efficiency upgrade

Tip: Contact Rite Price to check if your service is eligible under SA REPS or VIC VEU.

Conclusion: Don’t Ignore Your Pilot Light

The pilot light may be small, but it’s vital to your heater’s safe function. If it goes out repeatedly, won’t light, or burns yellow—don’t ignore it. These issues often signal deeper mechanical or gas-related problems.

With basic understanding, you can troubleshoot some issues safely. But remember—when in doubt, always contact a licensed gas fitter. They’ll ensure your heating system runs efficiently and, more importantly, safely.

✅ Need a Professional?