Some multi zone t'stats can loose track of the second zone or furnace , if there are fuses for those components blown , or circuit breakers tripped.
Could you add the year of the RV and brand of the t'stat to your post.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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