Once the flame cuts off the heater vibrates

dont know depends if both are lp or natural gas

you will have to look into why the unit is tripping and needs resetting. Heaters usually have a fan delay, meaning that when the heat is satisfied, the fan continues to run for about an minute. If not, it could cause an overheating issue and trip a safety. Look for that to start with.

That's a nice unit! You need to clean out the jet openings with a very thin piece of wire and, while you are at it clean off the whole grill so that no particles get trapped near the jets.

Check the high and low snap disk and check wall thermostat if fitted.

My heater has been doing the same thing. You do not need to remove the grille cover to reset it. Poke a small screwdriver through a vent slot and reset the small red button. Allow the heater to cool off before resetting. When the vent reaches 260 degrees, the switch cuts off the furnace. The solution is to place a fan pointed at the top and side of the furnace so it doesn't get scorching hot. It happened to my furnace continually when a strong, cold west wind was hitting my roof-top vent. When the storm passed after two days, the furnace operated normally again.

It appears that you have a draft problem with this heater. too much air causes the flame to lift off the burner or too much gas pressure could cause the same symptoms. check your draft at your burner first just to make sure that it's not open too wide. unfortunately the gas pressure has to be set with a manometer to get the correct pressure. 11.7in. wc for LP gas and 3.5in. wc for natural gas.

First, turn off the gas valve for at least 5 min and ventilate the room. Most wall heaters are lit the same as a water heater. Find a red button to push or turn the gas valve knob to the pilot position. While pressing the red button or the gas valve knob, hold a match to light the pilot flame. After it lights continue holding the knob for one or two minutes. If the flame goes out when you release the knob the thermocouple is probably bad.

pipe feed could be too small poor flow of gas or flamesafety is cutting in

Lets get a tech in there to get it cleaned and the gas pressure checked.

check the regulator.