Cooker Hob Ignition Problems: Causes and Fixes

A hob that clicks repeatedly but will not light can stop dinner before it starts. Cooker hob ignition problems often stem from something simple, such as moisture around a burner cap or food debris blocking the ignition electrode. In other cases, the fault lies with an electrical ignition part or gas supply issue. The key is to work through the safe checks first, rather than replacing parts at random.

Start with safety and the symptom

If you can smell gas, do not attempt to light the hob again. Turn the burner controls off, open doors and windows, avoid electrical switches or naked flames, and follow the gas emergency advice supplied by your gas network. A strong or persistent gas smell needs professional attention.

For faults without a gas smell, switch off the hob at the mains before removing burner caps or cleaning around the electrodes. Gas hobs use electricity for the spark system, so isolating the power protects you from an electric shock and prevents accidental sparking. Allow the hob to cool fully first.

The hob's behaviour gives useful clues. Does one burner fail while the others light normally? Does every burner click? Is there a visible spark but no flame, or no clicking at all? These details narrow down whether the likely cause is local to one burner or affects the ignition system as a whole.

Cooker hob ignition problems caused by dirt or moisture

The most common fault is also the least expensive to resolve. Each gas burner has a small ceramic-covered ignition electrode beside the burner ring. When you turn the control, it produces a spark to ignite the gas. Grease, boil-overs and cleaning residue can prevent the spark from reaching the gas properly.

Remove the pan supports, burner caps and burner crowns only once the hob is cold. Check that the caps are sitting correctly and are not upside down or offset. A burner cap that is only slightly out of position can cause poor ignition, uneven flames or clicking without a flame.

Wipe the electrode carefully with a dry, lint-free cloth or soft toothbrush. Do not use a metal tool, and do not force or bend the electrode. It needs to sit in the correct position close to the burner while remaining clear of the metal burner parts.

Moisture is particularly likely after a spill or thorough clean. Water can sit in the burner wells and around the ignition points, causing continuous clicking or weak sparks. Dry the area carefully and leave the hob switched off for several hours if necessary. Gentle warmth from normal room conditions is preferable to applying direct heat.

Food deposits can also block the small holes around the burner ring. Clean them with a soft brush, then ensure all parts are completely dry before refitting. Avoid flooding the hob with cleaning liquid, as excess moisture can travel beneath the surface and affect the ignition switches.

If the burner sparks but will not light

A visible spark does not always mean the ignition system is the problem. If there is a spark but no flame, first check whether gas is reaching that burner. Make sure the burner control is being held in the ignition position for a few seconds, particularly if your hob has a flame-failure safety device. This device may need time to warm up before it keeps the gas supply open.

If other gas appliances are also not working, or every hob burner fails to light despite sparking, the issue could be the gas supply rather than the hob. Please ensure that the gas isolation valve has not been closed accidentally. For bottled gas, check that the cylinder contains gas and that the regulator is correctly fitted. Please do not attempt to alter the pipework, regulators, or gas connections yourself.

A burner that lights with a match or gas lighter but not with its own spark usually points to a dirty, damaged or incorrectly positioned electrode. Although this test can help identify the fault, avoid using a naked flame if you can smell gas, if the area is damp, or if you are unsure that the burner is assembling correctly.

When there is no spark or clicking sound

If none of the burners click, begin with the electrical supply. Check whether the cooker or hob isolator switch is on and whether the circuit breaker or fuse has tripped. Some hobs are connected to a fused spur rather than a plug socket, so the relevant switch may be nearby rather than behind the appliance.

Where the electrical supply is sound, a complete loss of ignition may indicate a failed spark generator, ignition module, wiring connection or set of ignition switches. These components vary significantly by model. Ordering a part based only on the appliance brand can lead to an incompatible replacement, so always use the full model number from the appliance rating plate.

On many gas hobs, the spark generator sends power to all burner electrodes. If every burner has stopped sparking at once, the generator or its power supply is more likely than several electrodes failing together. By contrast, one non-sparking burner commonly suggests a local electrode, lead or burner assembly issue.

A qualified appliance repairer can test these electrical components safely. If you are experienced with appliance repairs, only work on the ignition system after isolating both electricity and gas and only where the manufacturer’s instructions support the work being carried out. Never dismantle gas valves, injectors or supply connections unless you are appropriately qualified.

Why a hob clicks continuously

A hob that keeps clicking after you have released the control is frustrating and can wear the ignition system unnecessarily. The usual cause is moisture or debris around an electrode, but liquid beneath a control knob can also affect the ignition switch. This often happens after a pan boils over or after cleaning the control area.

Remove the burner components, dry the surface thoroughly and leave time for trapped moisture to evaporate. If the clicking begins whenever the hob is connected to the mains, even with dry burners and untouched controls, a faulty ignition switch or spark generator may be responsible.

Do not ignore persistent clicking for weeks. Apart from the noise, it can indicate an electrical component is being activated when it should not be. Replacing the affected ignition part is normally far more economical than replacing an otherwise reliable hob.

Choosing the right replacement part

Common replacement parts for ignition faults include spark electrodes, electrode leads, ignition switches, control knobs, burner caps and spark generators. The correct choice depends on the diagnosis. Replacing an electrode will not resolve a failed generator, while a new generator will not cure a burner cap that is sitting incorrectly.

Before ordering, please locate the model number on the rating plate. Its position varies, but it is often found beneath the hob, on the side of the appliance casing, inside a cupboard below the hob, or in the instruction manual. Note the complete code, including any letters and numbers after the main model name.

Model matching matters because burner layouts, electrode lengths, connector types and spark generator outputs can differ between versions of the same appliance range. A part that looks similar in a photograph may not fit securely or operate safely. Electro Spares makes this process easier by allowing you to identify compatible spares from the appliance model details.

When to stop and call a professional

Cleaning, drying and correctly refitting removable burner parts are sensible homeowner checks. Work involving gas connections, valves, internal pipework or a suspected gas leak is not a DIY job. Use a Gas Safe registered engineer for gas-related repairs and installation work.

It is also sensible to seek help if the burner flame is yellow and sooty, lifts away from the burner, goes out repeatedly, or remains uneven after cleaning and refitting the caps. These symptoms can involve combustion, air supply or gas regulation issues that need proper assessment.

A clean, correctly assembled burner and a model-matched ignition spare can bring many hobs back into service for a modest cost. Taking a few minutes to identify the exact symptom first helps you buy the right part, avoid unnecessary waste and keep a trusted appliance working for longer.

Q&A 1 – Hob not sparking at all

Q: My gas hob has stopped sparking completely when I press the ignition button. The gas comes out but there’s no click or spark. What are the most likely causes?

A: If there is no click or visible spark on any burner, start by checking that the hob has a live electrical supply and that the fuse or circuit breaker hasn’t tripped, as the ignition circuit needs mains power even on a gas hob.

A failed spark generator module, a faulty ignition switch, or a loose connection in the wiring loom can all stop the igniter from operating, while on some appliances a broken mains plug or damaged flex is the root cause.

If the hob has power but the ignition remains completely dead, it is usually more cost‑effective to have an engineer test the spark generator and switch and then replace the faulty component with a compatible spare rather than guessing and changing parts at random.

Q&A 2 – One burner won’t light but others are fine

Q: One ring on my gas hob won’t ignite, but the other burners work normally. Why would just one burner fail, and what can I check before ordering parts?

A: When a single burner will not light, the issue is often local to that burner: common causes include a blocked gas nozzle, food or grease debris around the ignition electrode, or a misaligned burner cap or crown that prevents the spark from reaching the gas.

Remove the burner cap and crown, clean them thoroughly, and make sure the electrode tip is clean, dry, and not cracked; also check that the cap sits flat and central on the crown so the flame path is clear.

If cleaning and repositioning do not restore ignition, the electrode wire for that burner may be damaged or the ceramic body of the electrode may be cracked, in which case replacing the electrode assembly with the correct part for your hob is usually the next step.

Q&A 3 – Ignition keeps clicking on its own

Q: My hob ignition keeps clicking by itself even when I’m not pressing the button, and all burners are already off. What causes constant sparking and is it dangerous?

A: Continuous clicking is often triggered by moisture or spills getting into the ignition switch or onto the hob surface, effectively “shorting” the switch so the spark generator is permanently energised.

Boiled‑over water, cleaning fluids, or condensation under the control knobs can all cause this symptom, and the first step is to isolate the hob from the mains, dry the area thoroughly, and allow time for internal moisture to evaporate.

If the clicking persists once everything is dry, the problem may be a stuck or failed ignition switch or a fault within the spark generator module, and these parts should be tested and replaced by a qualified engineer using compatible spares to avoid ongoing nuisance clicking or electrical hazards.

Q&A 4 – When to DIY vs call an engineer

Q: I’ve got ignition problems with my cooker hob. What can I safely check myself, and when should I stop and call a gas‑safe engineer or electrician?

A: As a homeowner you can safely check and clean visible parts such as burner caps, crowns, and the area around the ignition electrodes, ensuring they are free from food debris, grease, and moisture, and confirming that the hob is plugged in and the fuse is intact.

You should also make sure any recent spills are cleaned and dried, and verify that the gas supply valve is open and other gas appliances are working normally.

If problems involve internal wiring, repeated tripping of electrics, suspected leaks, or replacement of ignition modules and switches, it is safer and usually more economical to use a qualified gas‑safe engineer or electrician who can diagnose the fault correctly and fit the right spare from a reputable supplier such as Electro Spares.

Article Posted: 23/07/2026 20:08:53