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First of all are you running kerosene or diesel ? If you are using diesel, it does not burn as clean as kerosene which causes that burning rich smell. If you are going to use diesel, just use #1 diesel only but still may have a little rich smell. Don't use die red off road diesel. If you are using kerosene and want to check your air pressure on your pump, you will need a 10 lb. test gauge with a 1/8" NPT male pipe thread on the end of the gauge.There are 2 plugs on the back plate. Do not remove the upper plug with the hole in it. This is the adjustment screw for pressure. Clockwise increases pressure, counter clockwise decreases pressure. With the heater unplugged,remove the lower plug. Screw the test gauge in and start the heater. Check the pressure. Most are set between 5 1/2 and 6 lb. of pressure. Check your owners manual to see what your setting should be. If your pressure does not change, you have a worn pump and it would have to be repaired. Once you have the correct setting, unplug the heater, remove the gauge and install the plug back. If you feel that you are not qualified to perform this procedure, send it in to a local repair center.
Whatever it is sounds like you should clean it... carbon and soot build up in exhaust... if it is a ventless (which is info you should have asked about) than you will find that it is the second heater in line and is starved for fuel.
You didn't mention the model number, but they are all pretty basic. The flame sensor and thermo pile which are thin flame sensors, get charred and need to be cleaned. They should be cleaned with a soft cloth or even a dollar bill will work (a worn one)
When the heater shuts down it usually means it is not sensing the flame and this will cause it to shut off automatically. I have included a link to get the owners manual below.
check the photo eye. It's the little rubber boot on the bottom right on the back side of the burner. If it's dirty, it may not be shutting off the igniter. If the igniter runs continuously, the safety breaker will trip.