I have a fairly new 170000 ready heater that wasnt pumping fuel I found that the rotor assembly was broke and replaced it it now pumps fuel and sprays out nozzle but wont ingnite there is also a new ingnitor that has been installed . you turn on it glows fan starts and starts pumping fuel but wont ignite
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This is a difficult question, if the rotor and blades are clean, not contaminated with anything, it seems to point in the direction of perhaps the parts expanding with excess heat. Is the motor running normally, is it overheating?? Is the area where it is being used particularly hot? Have you used it when paint spraying, sucking in paint,causing the rotor to stick. Is there any free movement on the motor shaft? There must be a reason but this is one of those faults which is not clear cut. Sorry I can't be more help.
Just repaired a 60 and a 115. Neither was pumping air to fuel nozzle. Both rotor assemblies were bad. Pull off the filter assembly and then take off the plate on the back of the motor. You will probably find that the rotor is in several pieces.
Stop all air/vacuum leaks between the air pump & nozzle
If the problem persists, replace the nozzle. Desa recommended annual replacement. Simply stated- the nozzle wears out to a point that the fuel is a spray rather than a fog and the fuel can't burn completely.
You don't state the type being burned. Diesel smells more than kerosene.
The fuel pump is directly behind the fan motor as the fan motor runs both. The fuel filter is under the electrical control panel on the side of the heater usually has four to six 5/16 head sheet metal screws that hold it on. Remove the screws and then the cover comes off and this is where you will find the fuel filter.
My guess is that your statement "won't start" refers to the flame (lack of). If this is the case then ask yourself if the unit is getting fuel. If NO fuel, check the pump rotor- it may be broken. If SOME fuel, then set the pump pressure. Air pump pressure is directly relayed to proper fuel flow. Instructions http://www.reddyparts.com/pressure.htm
it's the ignitor itself, if everythingelse is working or new then your just not getting enough spark. Also check your air lines as they do tend to get brittle and if your not getting enough air it won't light either.
check pressure of the air compressor should be in the 3.0 to 3.5 range. not enough won't suck fuel, too much will blow out the flame. igniter either lights or it doesn't no in between. does the main flame come on?