The furnace should respond to the thermotstat where you set the temperature. Generally they are nothing more then a switch which closes the connection between (usually two wires) and that signals the furnace to run until the thermostat is satisfied (reached the setpoint you put it to). First question. Does the trailer get exceedingly hot or does it just appear the fan is running all the time? Some furnaces you can put it in fan mode and the fan will stay running all the time. If it's getting exceeding hot and you turn down the thermostat (don't look at the number is says ) Just turn it down five degrees at a time and wait to allow it to respond ( a couple of minutes) . If it shuts off then i would say the thermostat is faulty. If the fan is just running constantly it could be a wiring mistake or the temp sensor on the fire box of the furnace is stuck on and it's signalling the fan to keep running as it's not "cooled" off the fire box enough yet. Hope what i am saying makes sense. I don't know which furnace or thermostat you have but it should not keep running.
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2020 GMC 3500 Denali Dually Duramax 6.6
2013 Fuzion 342 ToyHauler (Ours)
2011 Harley Davidson Streetglide custom (Mine)
2012 Harley Davidson TriGlide (Trike) (Hers)
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