Does it have a thermostat hook up, maybe in a box on the back of the stove (should be T1 and T2?) Is it hooked up?
It may only be running on Idle/Pilot Mode? Is there a timer box hooked up, if so,it is telling to only feed a certain amount over a give period of time (every 10 mins or so).
You may have to hook up a cheap thermostat and adjust accordingly to make it feed more and get hotter.