The thermocouple is responsible for sensing the flame of a gas stove. When it is defective, the stove may still start like normal but will then go off once you release the knob. The thermocouple may have just worn out over time or been damaged.
There are many possible reasons why the burner will not stay lit - the gas jet may be blocked, the valve may be set too low, the air flow may be restricted, there may be an issue with the pilot light, and so on.
Your gas pressure is too high, and the flame is blowing itself out. Turn the pressure down a fraction on the regulator until it doesn't do that any more. If that doesn't work, call in a (licensed) gas engineer. Have them fix it and the other gas devices - it will likely have been many years since it was done.
The reason is likely due to a broken thermocouple in the stove system. When the gas is ignited, the thermocouple heats up and activates the keep-on mechanism in the stove, which is a safety feature to prevent gas from being deliverred without a flame.
Your gas oven could be turning off because its ventilation system is blocked. Additionally, your gas ignitor could be damaged or failed to light, you could have a broken thermostat, or you may be low on gas. Finally, your gas line may be blocked.
This happens when a burner is partially clogged, causing the level of the gas flowing into the burners to be reduced. If you haven't cleaned your stovetop in a while, grease and other cooking residue can build up and clog the burner and reduce the flow of gas.
Thermocouple and Thermopile Issues
They generate a small amount of electricity when heated by the pilot flame, signaling that the pilot light is lit and allowing the gas valve to open. Over time, these components can get dirty or fail, causing the gas fireplace to shut off abruptly or prevent it from staying lit.
Dirty or Clogged Burner Ports
Over time, debris like dirt, grease, and food particles can accumulate in the burner ports of a gas stove. These clogs can disrupt the flow of gas to the burner, leading to irregular burning patterns and popping noises.
Low gas pressure or a faulty gas valve can interrupt the gas supply, causing the fire to burn out. If you can smell gas near the fire, hear hissing sounds, or the gas leak detectors activate, you must contact a professional right away to check for safety.
Insufficient airflow or insufficient gas pressure. A defective, malfunctioning ignition board, flame sensor, light switch, thermostat, thermocouple, fan limiter, or draft inducer fan. The drainage line is blocked, resulting in a full condensate pan. Temperatures are so low that the furnace cannot stay lit.
Once you've located the thermocouple, do a visual inspection. You're looking for a few things. The first is signs of contamination on the tube, which can include discoloration, cracks, or pinholes.
A gas fireplace burner needs to be checked if the burner or igniter is not functioning properly. A defective burner will simply stop the gas supply to the fireplace, and the absence of gas will not allow the fireplace to burn. You'll need to replace the burner or igniter to fix this problem.
The gas burners may have developed a layer of dust and dirt, or a build-up of carbon, that makes it difficult for them to access the oxygen needed to light and stay lit. (This is one of the reasons you have a filter to protect the furnace's interior.)
The thermocouple, which operates as a safety device, turns the gas supply off when the pilot light goes out. It consists of a heat sensor connected to a solenoid; when the sensor is not heated by the pilot flame, the solenoid closes the gas supply line. When a thermocouple fails, the pilot light won't stay lighted.
Flame Sensor Problems
If the heat is at the appropriate level, the sensor will trigger the furnace's control board to blow warm air into the combustion chamber to complete the heating cycle. If a furnace's main burner shuts off after ignition, it could be due to dirt, dust, and other debris covering the flame sensor.
If dirt or dust covers the sensor, the flame isn't detected, and the furnace shuts down. Sometimes all that is needed is a simple cleaning of the flame sensor, but it may also be worn out and need to be replaced.
Faulty thermostat settings can cause your electric fireplace to turn on and off by itself. Adjusting or replacing the thermostat might fix the issue. Remote control interference from other electronic devices can disrupt your fireplace's operation. Fresh batteries and relocating interfering devices often help.
There's really just one telltale sign of letting you know when the thermocouple isn't working, and that's when the pilot light won't stay lit. If you experience this problem, it's important to have your thermocouple assessed as soon as possible.
Clean the thermocouple - using the emery cloth sandpaper, sand the ends of the thermocouple and then give it a finishing touch with the lint-free cloth. Hopefully, you can get to the ends of the thermocouple without having to detach it from the assembly, but you may have to do that.
We understand if you are fitting it to your own appliance that you may not need to be Gas Safe registered But if this caused a problem you may be liable to prosecution. Therefore we would recommend that you contact a Gas Safe registered engineer to carry out the work. Try Repaircare for a fixed price repair quote.
If your burner lights for a short time but then goes out, you may have a blockage in the gas valve. The gas line is what provides fuel to the burner to keep it lit.
Depending on power setting and number of burners in use, burners on an Electric Cooktop may shut off as a precaution to avoid overheating. Turn the home circuit breaker to the unit off for 30 seconds and back on again.
An oven that won't stay lit could be due to a faulty or weak igniter, gas supply problems, or clogged burner ports, which are common culprits for this issue. A weak igniter is often the primary cause of a gas oven not staying lit, necessitating replacement by a service technician to ensure proper heating.