The users manual for that Dometic thermostat could be available at the site in this link.
I helped a neighbor with a similar problem 2 years ago but can't remember the cure.
www.myrvworks.com/manuals/
EDIT : A quick internet search turned up 3 U tube videos on that t'stat too.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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