Ignition Failure: Why a Gas Burner Won’t Light on the Production Line

How a Gas Burner Is Ignited

Case 1: No Spark

Case 2: Spark Present but Gas Does Not Light

A spark in the wrong place is a classic line fault: the electrode gap is correct and the igniter strong, but the tip sits a few millimetres outside the gas cone, so the mixture is never ignited. This is why electrode position is a fixture-controlled dimension, not an operator adjustment. Gas supply faults are covered under F6: gas valve failure and combustion appearance under F3.

Case 3: It Lights but Goes Out Immediately

• The FFD is not proven in time — sensor out of the flame, loose connection, or valve will not hold (see F1);
• The flame lifts away or is unstable at the ignition point, so the sensor loses it;
• The gas flow is too low to sustain a flame once the manual start position is released.

Because ignition and flame proofing share the same first seconds, a unit that lights and dies is usually an FFD or flame-stability issue rather than an igniter fault — replacing the igniter here does not help.

Testing Ignition on the Line

1. Trigger ignition and confirm a spark is present at the correct point for every burner;
2. Confirm the burner lights within a defined number of attempts from cold start;
3. Repeat ignition over several cycles to catch intermittent sparking;
4. Verify the flame holds after release and that no unburned gas is vented;
5. Log attempts and result per serial number.

Repeated ignition attempts are themselves a safety issue: each failed click releases gas that must be allowed to clear before the next attempt, with an interlock or re-try limit so gas cannot accumulate. A gas cooker test bench controls the gas, triggers the spark, counts attempts, verifies the flame is established, and fails a unit that needs more than the allowed tries, interlocked with the leak (F2) and FFD checks.

Ignition Success Rate as a Quality Metric

Beyond a single pass/fail, the number of attempts each burner needs is a useful production metric. When a burner always lights on the first spark but the stored attempts begin to drift toward two or three, the cause is usually a wearing component — a weakening pulse igniter, an electrode gap opening with fixture wear, or a changing gas flow — rather than sudden workmanship. Logging the attempt count lets engineering fix the trend while the line is still passing, instead of reacting to a batch of non-lighting cookers. A first-piece and last-piece ignition check each shift is a simple way to catch drift that accumulates during the run, particularly when the igniter or electrode is a life-limited part.

Ignition is also sensitive to conditions the appliance must actually face. Moisture around the electrode, a low-temperature start, or a humid environment can weaken or bleed the spark even when the unit is dry and warm at the factory. Appliances destined for cold or humid markets should be checked in a condition that represents that start, not only in a warm, dry shop; the environmental side of this is covered by the chamber work in the environmental cluster. A line that tests only a single warm, dry ignition can pass units that fail on the first damp morning, which is precisely the intermittent complaint that is hardest to diagnose after export. Repeating the ignition over several cycles and keeping the attempt count removes most of these misses before they reach the customer. For the export team, that stored record also answers the most common pre-shipment question a distributor asks: whether every burner was confirmed to light on the first acceptable attempt, not just assembled. Supplying that evidence with the shipment is a simple, low-cost way to separate a factory from competitors who can only state that the units “were tested”. It also shortens any later dispute, because the attempt count and the pass result are already on file rather than reconstructed from memory.

Common Mistakes

• Replacing the igniter when the real fault is a mis-positioned electrode or no gas at the port;
• Testing only the first ignition and missing intermittent sparking on later cycles;
• Judging “lights fine” by eye without counting attempts;
• Letting repeated sparking vent gas with no retry limit or purge;
• Treating a light-and-die unit as an igniter problem rather than FFD/flame stability;
• Not controlling electrode position with the fixture.