--- title: "Gas burner will not light" description: "Bosch gas burner will not light — igniters clicking without catching, a burner that lights and goes out, or a flame that has turned yellow." url: "https://esbosch.djwp.xyz/symptoms/gas-burner-wont-light/" date_modified: "2026-08-21" Appliance type: "Cooktops & rangetops, Ranges" --- # Gas burner will not light Symptom # Bosch gas burner will not light Igniters clicking without catching, a burner that lights and goes out, or a flame that has turned yellow. Whether it is one burner or every burner is the fastest diagnostic on this site. - **From $95** diagnostic, credited to the repair - **59** cities and neighborhoods covered - **OEM** parts available on order - **In writing** the price, before anything is opened ## Book a diagnostic visit Your model number and a line about what it is doing is enough to get started. Your details stay private. No spam, ever. Five ordinary causes ## What this usually turns out to be Cheapest and commonest first, which is also the order we check them in. They sit hundreds of dollars apart, and only the unit settles which one is yours. - The burner cap out of position A millimeter proud and the burner will not catch. The most common cause and it costs nothing — lift it, seat it square, try again. ### The burner cap out of position A millimeter proud and the burner will not catch. The most common cause and it costs nothing — lift it, seat it square, try again. - Blocked ports A boil-over that dried in the holes around the burner. Clears with a pin or a stiff brush, cold and with the gas off. ### Blocked ports A boil-over that dried in the holes around the burner. Clears with a pin or a stiff brush, cold and with the gas off. - A wet or dirty electrode After a spill or a clean. It sparks weakly or in the wrong place. Drying it and giving it a day often does it. [ Gas burner & igniter repair from $145 ](https://esbosch.djwp.xyz/services/gas-burner-and-igniter-repair/) ### A wet or dirty electrode After a spill or a clean. It sparks weakly or in the wrong place. Drying it and giving it a day often does it. - The flame sensor If the burner lights and goes out the moment you release the knob, the sensor is not confirming the flame — a safety device doing its job with a failing part. [ Gas burner & igniter repair from $145 ](https://esbosch.djwp.xyz/services/gas-burner-and-igniter-repair/) ### The flame sensor If the burner lights and goes out the moment you release the knob, the sensor is not confirming the flame — a safety device doing its job with a failing part. - The ignition module or supply When no burner will light. That is upstream and it is a real repair rather than a clean. [ Gas burner & igniter repair from $145 ](https://esbosch.djwp.xyz/services/gas-burner-and-igniter-repair/) ### The ignition module or supply When no burner will light. That is upstream and it is a real repair rather than a clean. In five minutes ## Before you call anybody None of it needs tools, and all of it makes the visit shorter. - 01 One burner or all of them? The first question, and it removes most of the possibilities immediately. ### One burner or all of them? The first question, and it removes most of the possibilities immediately. - 02 Lift the cap and reseat it Cold, with the burner off. It should sit flat and square in its recess with no gap on one side. ### Lift the cap and reseat it Cold, with the burner off. It should sit flat and square in its recess with no gap on one side. - 03 Look at the ports The small holes around the burner ring. Anything baked into them stops the flame traveling around the ring. ### Look at the ports The small holes around the burner ring. Anything baked into them stops the flame traveling around the ring. - 04 Dry everything and try tomorrow If it started after a clean or a spill, give it a day. Moisture around the electrode is a real and common cause. ### Dry everything and try tomorrow If it started after a clean or a spill, give it a day. Moisture around the electrode is a real and common cause. How it shows up ## What people describe when they call - “Clicks but does not catch” - “Lights, then goes out when released” - “A yellow or lifting flame” A shortcut ## Narrow it down before anybody arrives A description of the behaviour leaves a few possible causes. A code names the subsystem before anybody opens anything, which is why it is worth photographing before it clears. If there is no code at all The data plate is inside the cabinet, upper left wall or behind the grille. [ All models ](https://esbosch.djwp.xyz/models/) In more detail ## About Bosch gas burner will not light ### The fastest diagnosis is the code There is no code for this — gas burners do not report to a display. What replaces it is one question: is it one burner or all of them? One is that burner. All of them is upstream, at the module or the supply. ### The fastest diagnostic there is One burner misbehaving is that burner: the cap, the ports, the electrode. Every burner at once is upstream: the ignition module, the supply, or the power to the module. Establishing which takes seconds and it decides everything after it. ### What you can safely do yourself With the burners off and completely cold: lift the cap, check it sits flat and square, and look at the ports for anything baked into them. That is the whole home-repairable list, and it is behind a surprising share of these calls. This article is based on: - Official manufacturer documentation - Internal repair procedures - Technician repair history - Company quality standards Before you book ## Questions about bosch gas burner will not light Normal on many of these — one module sparks every electrode. What is not normal is clicking that carries on after the burner has lit, which usually means a wet or dirty electrode. The flame sensor is not confirming the flame. It is a safety device behaving correctly with a failing component, and it is a known repair. Worth acting on — it points at air, pressure or a partly blocked burner. Not an emergency today, but the cheapest moment to fix it is now. 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