Welcome to the forums Stephim04, we hope you can learn a little and hopefully teach us old folks a little. As noted, your question left us with more questions than answers, it is helpful if we really know what you are talking about, you provided us with a manufacturer but not a model, we don't know what year the heater was made or what thermostat connected to the heater.
It's also helpful to know a little about your rig, age, make, model, size and if you have any of the manuals provided by the RV manufacturer.
I'm going to assume that the reset button you're referring to is actually an on/off switch on the thermostat and not a reset switch. You can tell by our confusion that this is something new to us.
Normal operation is the thermostat is set to heat, turned on and the temperature is set to desired level. If everything works as intended, when the temp drops below the setting on the thermostat, the fan starts, when it reaches a predetermined speed it closes a switch called a sail switch. When the sail switch closes, propane is allowed to flow and an ignitor starts clicking and ignites the gas.
When the desired temp is met, the gas is shut off by the control board and the fans runs for awhile longer and cools off the heater.
When the temp drops, it goes through the same on/off routine until you turn it off using the switch on the thermostat.
A lot of us had the old round dial type thermostats that were not very accurate and we change them out for digital thermostats used in homes.
As you can understand, "The devil is in the details" and you didn't give us a lot of details.
Don't be discouraged, we want to help and collectively we're smarter than most manufacturer techs. We do have the answer you're looking for.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II
