An RV furnace needs to see the sail switch closed before the ignition cycle starts .
Do you have the manual for the furnace ?
The issue can be ;
A bad sail switch .
Low fan speed ; due to low battery voltage or problems with the motor.
Restrictions in the furnace output vent , or cold air return ; that might slow the air flow through the furnace fan .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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