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Gas Oven Won't Ignite? Common Causes and Fixes
Gas Oven Won't Ignite? Common Causes and Fixes — a Prime Plumbing & Gasfitting plain-English guide to gas oven wont ignite for Melbourne homeowners. Below we cover what works, what doesn't, and when to call a licensed plumber.
Quick answer: A gas oven that won't ignite is almost always one of four problems: a failed glow-bar igniter (the most common — typically lasts 5-10 years), a failed thermocouple or flame sensor, a gas supply issue (cooktop also won't work, gas is off, regulator fault), or a failed safety/control valve (less common but worth checking). DIY-safe checks: confirm gas works at the cooktop, check the oven knob is on the right setting, listen for the igniter clicking. Anything beyond that — replacing the igniter, testing the thermocouple, opening the appliance casing — is a Type A gasfitter's job in Victoria. Most repairs are $200-$500. If your oven is more than 15 years old and the repair cost is significant, replacement may be the better call.
How a gas oven actually lights
Modern gas ovens have an electronic ignition system rather than a continuously-burning pilot light. The sequence when you turn the dial:
- Knob turns — opens the gas valve to the burner (slightly), and powers the glow-bar igniter
- Igniter heats up — a ceramic element with a metal coil that glows orange-hot in 30-60 seconds
- Once igniter is hot enough, the safety valve opens fully and gas reaches the burner
- Gas ignites off the hot igniter
- Flame sensor or thermocouple detects the flame and signals the gas valve to keep gas flowing
- If no flame is detected, the gas valve closes within seconds — preventing gas buildup
This sequence is why an oven might not light: any link in the chain that breaks stops the whole process. The igniter doesn't get hot enough; the safety valve doesn't open; the flame sensor doesn't detect; gas isn't flowing in the first place.
When DIY troubleshooting ends and a Type A gasfitter starts
Acceptable DIY: replacing the oven's power fuse, checking the gas tap is fully open at the appliance isolator, verifying the cooktop on the same gas line still works. Past that point, every diagnostic step involves removing the back panel and putting a multimeter on the safety circuit, or pressure-testing the gas line — both are licensed Type A gasfitter work. Doing it yourself voids your appliance warranty and your home insurance. See our gas fitting service for licensed gas appliance diagnosis.
The four most common failures
1. Failed glow-bar igniter (most common)
Symptom: you turn the oven on, hear a click or two, but no orange glow inside, no whoosh of ignition. After a minute or two, you smell gas faintly because the safety valve never opened — or you smell nothing because the safety valve correctly held gas back.
Why it fails: glow-bar igniters degrade over time. Each cycle wears the ceramic element slightly, and after thousands of cycles the resistance changes enough that the igniter no longer reaches ignition temperature. Typical service life: 5-10 years.
The DIY-safe check: turn the oven on and look through the door (with the light on) at where the igniter sits. It should glow bright orange within 30-60 seconds. If you see no glow — or only a faint dim glow — the igniter is the culprit.
What it costs: typically $180-$350 for the igniter part plus labour. A gasfitter typically replaces it in 30-60 minutes once they've isolated the appliance.
2. Failed thermocouple / flame sensor
Symptom: the oven lights briefly (you see flame, you hear ignition) but shuts off within 30 seconds. No matter how many times you try, same result.
Why it fails: the thermocouple/flame sensor is a heat-detecting probe that signals the gas valve to keep gas flowing once flame is established. When it fails, the gas valve thinks there's no flame and shuts off as a safety measure. Thermocouples last 5-15 years typically.
What it costs: typically $150-$300 for the thermocouple part plus labour. Quick replacement.
3. Gas supply issue
Symptom: oven won't light, AND the cooktop doesn't work, AND other gas appliances aren't working.
Why: the gas isn't reaching the appliance. Possible causes:
- Gas turned off at the meter (someone shut it; emergency previously isolated)
- Distributor outage (gas company doing works on the network)
- Regulator failure at the meter
- Frozen regulator on the coldest mornings (rare in Melbourne)
- Crimped supply line behind the appliance from a recent installation
The DIY-safe check: try a gas cooktop burner. If it doesn't light either, gas is off or supply is restricted. Call the gas distributor (000 in Victoria) for network outages. For appliance-specific isolation issues, a Type A gasfitter can confirm.
4. Failed gas valve / control board
Symptom: igniter glows, but no gas reaches the burner. You see the orange glow, hear the sequence, but no flame and no smell of gas.
Why: the gas valve doesn't open even though the controller has called for ignition. Could be the valve itself, the controller, or a wiring fault between them.
What it costs: typically $250-$600 for the part plus labour, depending on the brand and model. On older ovens, parts can be unobtainable — at which point the appliance is at end-of-life.
Why DIY repair on gas appliances is illegal
In Victoria, all work on gas appliances and gas pipework is regulated under the Gas Safety Act 1997 and requires a Type A Gasfitter endorsement. This includes:
- Replacing igniters, thermocouples, gas valves
- Testing gas pressure or flow at the appliance
- Opening the appliance casing for diagnosis
- Any work that disconnects or reconnects the gas supply
The reasons are straightforward: an incorrectly-replaced part can cause a gas leak, an explosion, or carbon monoxide. Insurance will not cover damage caused by unlicensed gas work, and most home insurance policies explicitly exclude it.
A licensed gasfitter has the right test equipment, parts knowledge, and is required to pressure-test and re-commission any work they do — and lodge a Certificate of Compliance with Energy Safe Victoria for repairs above a defined threshold.
For gas appliance service and repair in Melbourne, our gas fitter service covers ovens, cooktops, hot water units and heaters.
When repair vs replacement makes sense
A gas oven repair is usually worth doing if:
- The oven is less than 10-12 years old
- Repair cost is under 30-40% of replacement cost
- The model is current (parts available)
- The oven is otherwise functioning well
- The appliance has been generally reliable
Replacement makes more sense if:
- The oven is more than 15 years old (you're paying for ongoing repairs at end of life)
- Multiple repairs in the past 2-3 years
- Parts are obsolete or hard to source
- The appliance has been chronically unreliable
- You're already planning a kitchen renovation
A licensed gasfitter will quote the repair and, if relevant, give you an honest view on whether replacement is the better call. We'll never push replacement when repair is sensible — but we'll also tell you when an oven is at the end of its useful life.
Service area
Prime Plumbing & Gasfitting services gas oven repairs across Melbourne's eastern, south-eastern, inner-east and bayside suburbs. See all suburbs we service →
Book a gas oven repair
Call 0475 407 670 during business hours or send through the gas oven repair request. Tell us the oven brand and model, age, and what you've observed (igniter glow yes/no, flame on/off pattern) — it helps us bring the right parts.
- BPC #103414 — Plumbing Industry Commission licensed
- Type A Gasfitter — registered with Energy Safe Victoria
- 4.8 stars on Google
- Certificate of Compliance lodged with ESV where required
When to call a licensed plumber
The Victorian Building Authority maintains a plumbing licence search so you can verify your gasfitter holds the Type A endorsement.
Frequently asked questions
Most likely the gas valve isn't opening — the controller called for ignition (igniter glowing) but the safety circuit isn't allowing gas through. Could be a faulty valve, a wiring fault, or a fault in the safety circuit. Needs a gasfitter's diagnosis.
No. Modern gas ovens have safety systems that won't open the gas valve unless the appliance has detected ignition. Trying to manually light a gas appliance bypasses the safety chain and is dangerous — gas can build up in the oven cavity before you light it, producing a flash. Don't attempt it. If the oven won't light through its own ignition system, don't try to bypass — call a gasfitter.
The click is usually the relay activating in the controller. If the relay clicks but no glow follows, the igniter has failed (broken element) or is no longer drawing enough current to heat properly. Replace the igniter.
Yes. A faint persistent gas smell at the oven means gas is leaking but not igniting. Turn off the oven, don't operate any electrical switches in the room, open windows for ventilation, and call a Type A gasfitter or 000. Don't keep trying to light it — you're filling the oven cavity with unburned gas.
Yes — the cooktop and oven usually share a gas supply line. If the cooktop works, gas is reaching the appliance and the issue is internal to the oven (igniter, valve, thermocouple, controller). This is the classic isolation pattern that points at the oven itself rather than gas supply.
A typical gas oven repair takes 1-2 hours from arrival to fully functional and tested. The longer time is usually parts availability — if a specific igniter or thermocouple isn't on the van, we'll source it (same day for common brands, next day for less common) and return.
If your oven is within manufacturer warranty (usually 12-24 months from new), warranty repair through the manufacturer's authorised service is usually free or low-cost. After warranty, a licensed gasfitter is your best option. We can do warranty work in some cases if the manufacturer has authorised us — ask when you call.
A sudden failure is more often a degraded igniter that finally crossed the threshold (reached the end of usable life on a specific cycle), a thermocouple that failed, or — rarely — a gas supply issue. Sudden failures are easier to diagnose because you have a clean "before/after". Get a gasfitter out for a diagnosis.
How much does a gas oven repair cost?
Indicative ranges only — depends on the diagnosis, parts, and access:
- Diagnostic callout: typically $150-$250 (often credited toward repair)
- Igniter replacement: typically $250-$450 supply and fit
- Thermocouple replacement: typically $200-$400 supply and fit
- Gas valve replacement: typically $400-$700 supply and fit
- Multi-fault repair: quoted after diagnosis
- End-of-life replacement quote: free as part of diagnostic visit
We always quote in writing first.
- When did the issue start?
- Is it isolated to one fixture or multiple areas?
- Are there any visible leaks, smells or unusual sounds?
- Have you turned off the relevant isolation valve?
- Gas fitter Melbourne — gas appliance install, repair, replacement, CO testing
- Gas leak detection Melbourne — for suspected gas leaks at the appliance
