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Take the top cover off of the unit. Plug it in and look inside the burner can to see if the ignitor is glowing. If not you probably need an ignitor. You can remove it to check the heating element to see if it is intact, but be very careful, it is more fragile than glass. If it is intact, you may have a control board issue. The ignitor should glow before the fan starts. Be careful to stay away from the fan blades while doing this. If the ignitor glows, and the motor starts, you should then be able to see fuel spraying out of the spray nozzle. You may need a flash light. If the fuel does not spray out of the nozzle in the correct amount, the unit will shut down. There is a photo cell that detects ignition. If the fuel pattern does not look even, you could have low air pressure out of the pump, a dirty fuel nozzle, or a plugged fuel screen inside of the tank. The air pressure comes from a pump on the back side of the blower motor. Insure that the filter are clean on the pump; there are three of them, and the plastic end cap needs to come off to access them. If they are dirty, they need to be replaced. The air pressure off of this pump is very critical to proper fuel delivery. The rated output pressure of the pump is on the heater data plate. You will need a low pressure air gage to check this pressure. Another source of low air pressure is the plastic end cover over the filters. They tend to crack with age. Spray soapy water on the end cap while the blower is running to look for leaks.
I am sure you have confirmed that the fuel is fresh and good, no water in it, etc.-- It is kerosene, not #2 Diesel fuel, right?
And the shutting down is good, if the flame does NOT ignite--- :-) So we have to figure out why the fuel is not getting hot enough to ignite?
Question-- is the oil spray passing close enough to the ignitor? And this unit does NOT use SPARK to ignite?, correct? -- for most of these heaters have spark ignition.. I am learning all the time, too!
How about checking the fuel pressure. and the air -- is it correct? Check with your manual how to check and adjust.
After testing these tings, let us know what you learned
This could be several problems. Check your fuel first. If it is old fuel from last year, get rid of it and fill with fresh. If it has water in the tank, your spraying water to your ignition source. If you have fresh fuel, it could be a fuel filter stopped up or your air pump is not set properly. Also check your ignitor to see if it is working properly. Some have a spark plug and some have a glow type ignitor.
This is going to be a tough one. You have been thorough, done it right, and it damn sure ought to fire off every time!
There is something that is causing you a problem and don't think that because you put in new parts that you didn't get a bad part. It happens. Not often, but it does happen. I have rec'd nozzles from the factory that had the orifice installed sideways, so, I know it happens.
If the ignitor glows- (it only stays on for 5 seconds, then quits)
If the fuel fogs (not sprays)
If the fuel hits the glowing ignitor
Then it should fire off-- every time.
Now, if the photocell doesn't like what it sees, then the photocell will shut the heater down within 5 seconds, but it at least should have ignited. Right? Unless the photocell or the board are bad. Maybe.
Lift the top, and watch. What's happening. Are you having a fuel problem or an electronics problem? For instance- is the ignitor glowing every time at start up or only sometimes.