MODEL R165DT-REDDY HEATER 165000 BTU-I HAVE PUMP PRESSURE-CLEAN FUEL FILTER AND NOZZLE IS CLEAR-SOME ONE HAS BEEN INSIDE THE UNIT BEFORE-DOES FUEL LINE GO NEXT TO BURNER HOUSING OR PUMP LINE-IT NOW HAS FUEL LINE NEXT TO BURNER HOUSING-I'M NOT GETTING FUEL AT NOZZLE-IGNITOR GLOWS-PUMP STARTS BUT NO FUEL-UNIT STOPS AFTER 5-6 SEC
FOUND THAT THE FUEL HOSE AND AIR PUMP HOSE HAD BEEN REVERSED AT THE NOZZLE-PUMP HOSE NEEDS TO BE CLOSEST TO THE BLOWER HOUSING-I USED A VAC GAUGE TO TEST THE FUEL LINE-WHILE THE AIR PUMP WAS RUNNING-NO VAC-REVERSED LINES AND STARTED UNIT-ADJUSTED AIR PRESSURE-ALL IS WELL
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You need to make sure the filters are clean and that you are getting the proper air pump pressure.
If the units starts up and runs good and slowly goes out it will normally be due to a lack of fuel getting to the nozzle. When there is not enough fuel being delivered to the nozzle from either a clogged fuel filter of dirty air pump output filter the unit will slowly shut down from lack of fuel.
If the unit shuts down while it is running properly and the nose come is orange then you probably have a problem with a photocell or the flame out control.
Clean, waterless fuel and correct air pump pressure are absolutely a requirement for a good running heater. Drain the tank, set the air pump pressure. Your problem could be more serious, such as losing air between the pump & nozzle, a worn nozzle, or a restricted fuel filter.
the black hose that goes to the back hooks to a pump on back of motor take screws off back and filter clean when back together turn fan by hand and should hear a small vacum at back of motor , not pluged in clean nozzel
Your problem is most likely the lack of pressure from the air pump. Your pressure is extremely low. Pressure on a 100k heater should run 5psi. At 3psi there is not enough fuel and not enough air to atomize whats there. Bump the pressure up. If it won't come up, then you have an air leak. Test w/ soapy water. Keep your fingers clear of the fan!