Cosmo Appliances

Fuel Your Culinary Passion

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    COS-F965 Gas Cooktop Troubleshooting

    Check that the unit has been installed properly: Gas Installation Troubleshooting.

    Cooktop burner(s) will not light
    1. My burner sparks or clicks when turning the knob to ignite.
      1. Check for a gas smell when turning the knob.
        1. I do not smell gas.
          1. There may be air inside the gas line(s) from manufacturing, storage, or shipping. 
            1. Repeat the proper lighting procedure several times.
            2. If you begin to smell gas, proceed to the next step.
        2. I smell gas:
          1. Remove the burner and burner cap to inspect the burner ports for any obstructions such as food particles, dried liquids, etc. If debris is found, clean the burner and burner cap with warm, soapy water and a non-abrasive cloth. Allow to dry completely before replacing.
          2. Add the burner and burner cap back onto the cooktop and ensure they are seated properly. They should wiggle slightly when moved left + right, but should remain in place.
          3. Attempt to light the unit manually using a long stem lighter.
          4. Check for a visible spark on the igniter electrode next to the burner. Make sure you can see the actual spark coming from the white igniter electrode.
        3. Ensure the knob, spring, and backplate are installed properly:
          1. The back plate should be centered so the holes line up with the holes on the unit, and any screws or pegs included (if applicable) are inserted in the correct orientation.
          2. Next, slide the spring around the valve shaft coming out of the unit, with the wider end facing towards the unit.
          3. Finally, slide the knob onto the valve shaft, taking care to keep the spring and backplate in position.
        4. If burner(s) still does not light on its own, contact support or a qualified technician for further troubleshooting and diagnosis.
    2. My burner does not spark or click when turning the knob to ignite:
      1. None of my burners spark or click when turned on:
        1. Check that the electrical has been installed properly: Electrical Installation Troubleshooting.
      2. Check if the burner sparks only when another knob is turned. Press and hold another knob to actuate the ignition system. While holding the knob on and allowing the igniters to spark, turn the knob for the affected burner as if lighting it normally. If it lights, contact tech support.
      3. My burner does not spark even when another knob is pushed and held in.
        1. Check that the burner and burner cap are properly seated by removing them from the unit and replacing them.
        2. Check for a visible spark on the igniter electrode next to the burner. 
          1. If you see a spark on the tip of the electrode, hold the knob in longer to allow ample gas flow to make contact with the spark. 
          2. Try lighting the burner with a long stem lighter, and if it does not light, there may not be gas flowing. 
      4. If the burner(s) still does not spark properly, contact support or a qualified technician for further troubleshooting and diagnosis.
    My cooktop burner(s) will light but will not stay lit
    1. Remove the affected burner(s) and cap(s) from the unit.
    2. For the models COS-965AGC, COS-965AGFC, COS-244AGC, F965, F965NF, 850SLTX-E, 950SLTX-E, 640STX-E, VA-S950M, COS-965AG, COS-965AGF:
      1. Locate the silver and bronze tip extending next to each burner.
      2. Using a dry cloth or paper towel, clean the tip to remove any residue that may be present. The residue may not be visible to the human eye.
    3. Replace the burner(s) and cap(s) to ensure they are properly seated.
    4. Light the burner and hold the knob on to heat up the thermocouple safety device.
    5. Continue holding for up to 60 seconds. 
    6. Release the knob. The flame should stay on.
    7. If the flame still extinguishes on its own, it may need to be calibrated.
    8. If the burner still does not stay lit after several attempts, contact support or a qualified technician for further troubleshooting and diagnosis.
    My burners are too high or too low
    1. The burners on your Cosmo cooktop are designed for higher efficiency and may appear higher or lower than other cooktops.
      1. Give yourself time to adjust to the new cooktop by cooking on it for at least a week.
      2. If food is cooking too quickly, try a lower temperature.
      3. If food is cooking too slowly, try a higher temperature.
      4. If your food is still cooking too quickly or slowly, even after adjusting the flame height, contact support or a qualified technician for further troubleshooting and diagnosis.