L-36.com has a copy of the Force 10
propane stove manual. Page 17 gives troubleshooting instructions for:
Ignition System Fails to Spark or Begins to Spark Slowly
1. Check the battery to ensure that it is an AA 1.5 volt, that it is still giving
power, and that it is installed the right way. The battery holder is located on the underside of the
stove at the bottom front right hand corner. Install a new battery if necessary. In certain locations,
salt air can corrode the battery holder.
2. Check to see whether there is 3/32" (2 mm) gap between the spark
plug head (which should be clean) and the burner rim, and that all the wires are securely connected to the spark ignition box located midway down the backside of the stove. A quick way to check is to press the spark button, and look to see if spark is sparking between terminals.
3. Remove control knobs and faceplate and check the wire connections at the back of the spark ignition switch. Check the operation of the switch with a circuit tester.
4. Remove the stove and disassemble wo that each spark ignition connecting wire can be checked for shorts. Sometimes a minor nick in the wire will cause a short so the spark
plug will not spark at that burner.
5. If none of the spark plugs will spark, first replace the battery and check again. If they still will not spark, order a replacement spark ignition box from Force 10.
Sometimes the burner will sputter for a while before igniting. Give your range 10-15 seconds to purge the air out of the gas line.