Turning the solenoid off seems to require a lot less voltage than turning it on. So, if the battery started to get weak, you would (in theory) be able to shut the burners, without being able to turn them back on. In fact, that's my whole problem. The latch, which is activated by the solenoid, closes no matter what kind of batteries I use. However, even after I wired a 9 volt to the 6 volt receiver box, the latch eventually got stuck again when I tried to turn on the burners.
Short of hooking up a car battery to the solenoid,
I'm fresh out of ideas and will have to wait for the new parts to come... unless there's a way to take the solenoid apart and lubricate the latch or replace the spring??