Have always also had a manual for the thermostat in every rv we have owned. Should be able to get it online. Helps to know exactly what model thermostat it is in order to point you in the right direction. Most of them have a sequence of holding two buttons down while turning power on to the thermostat. On one of my rv's, I had a similar issue caused by 12vdc not going to the unit. Emergency heat mode on a thermostat usually turns on 120vac heat coils in an ac unit IF it has that option, otherwise it does nothing. Sorry, can't be of more help so far. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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