That definitely looks like a hillrrange. Here is a link to sure marine, and a troubleshooting guide.
https://www.suremarineservice.com/site/PDFs/manuals/Stove-Repair.pdf?srsltid=AfmBOoq8BTMyJQXKN4mEL99h0aoQeJLefodvIgqXp7gFXHfR7OpvJQX7 Douglas Mountjoy 1988 C&C Landfall 39 sv Rebecca Leah
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