Blows raw fuel when trying to start. Take top cover off and it will start. Will run when putting top back on. Will not start again unless I take top cover off. Has two screw, I assume adjustments, on the end One is bigger than the other. How are they used for adjustment. I don't have a manual.
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When mine did this it was contaminated fuel. What I am saying is that from storage these will build condensation (water) in the tank. So I emptied mine out in to a clean five gallon bucket and observe, Fuel floats on top of the water and you will see the water bubbles under the fuel. If this is the case you need to dry out the tank as best as you can and then put fuel back in it. Now you can carefully siphon off most of the fuel and reuse it just be careful not to **** up any of the water. If this is not the problem you need to go over the fuel delivery system and clean it out completely
These heaters have several things that happen to them while in storage. I do a yearly check on mine and it goes like this. Open the fuel tank and tilt the heater to see fuel at the filler hole, look at the fuel and tank you are looking for any water in the tank. Condensation is usually the culprit, what I do is drain the tank in to a clean five gallon bucket and the fuel floats on top of the water. If you see water use a rag and try to dry out the tank as best as you can. You can also siphon off the fuel for reuse just be careful not to siphon to much and get the water again. Next remove the top section of the heater tube, this exposes all of the internal burner parts. Locate the burner tray and remove it so you can access the fuel nozzle. Remove the nozzle, they say you cannot clean these but I say different. You need a Q-tip, tooth pick and carb cleaner and clean it up carefully so you do not damage the nozzle. Behind the nozzle is a screen these like to corrode so clean it real good too. Put the nozzle assembly back together, inspect your fuel lines for cracks, dry rot or holes and replace if necessary. At the bottom of the assembly there is a sensor for flame these collect carbon deposits,dirt and the occasional homeless insect. Clean this with windex and a soft terry cloth rag. Put the burner tray back together. Trace the fuel lines back to where they come thru the heater tube and now remove the side cover. You will find the fuel line and an in line filter remove the filter and clean this with a compressor and blow gun by blowing air backwards thru the filter. This instantly cleans the filter, now put it back together after inspecting the fuel lines,and replacing it if necessary. Put the side cover back on and go to the fuel/ air pump on the back of this there should be an air filter usually foam, clean this with dawn dish soap and dry really good before putting it back in.Inspect and clean igniter while you are inside the heater, then put the top section back together. Now you are ready to plug your heater back in and test it. If all went well you should be heating like it did when it was new. Just a tip for you is to look at the fuel coming out the nozzle it should be a fog not droplets, if droplets your nozzle needs changed. Pay attention to spray angle and GPH rating very very important.
I am not to sure of the trouble codes on Mr.Heater but this is usually a fuel related problem. My routine maintenance is remove top half of heater and clean fuel system from nozzle back to the tank.Remove nozzle,clean the screen behind the nozzle they corrode over the summer sometimes inspect the nozzle for corrosion or damage. Inspect lines back to pump then to filter. The filter can be cleaned out with compressed air and a blow gun blowing air thru the filter backwards. Now check the fuel line to the tank and make sure it is submerged in the fuel. Before putting the top on locate the fire sensor and give it a quick cleaning with windex and soft terry cloth rag. Put your heater back together and check air filter to pump clean it and fire away. This works 90 percent of the time. Good luck!
the air pressure is to high,another thing, it coild be blowing too much air from the fan,I have had to rebend the fan to compinsate for this.first check the air pressure reading. you need a gauge to do this.
Sounds like it's not getting enough air to fuel mix, check your air inlet line for breaks or just put a new one on for a couple bucks. any fuel line thats the right diameter will work, got mine from auto zone.
It sounds like it is currently working .. is that right? Or does it only work if you let it sit for an hour, still? The blue smoke probably is from the residual fuel not burnt when it "threw raw fuel out the end" some the fuel probably drained to a low point ..outside of the combustion chamber and then may have ignited after shut down.. to cause the blue smoke out the back... when you turned it off.
If when your starting it up... it doesn't start the first time.. wait 10seconds then try again.. noting what it apparently does.. and doesn't do. does it just 'through fuel for 5 seconds.. does the fan spin .. and push air at the same time when its starting? If yes for both, does the ignitor ignite the fuel/air mixture, briefly then it shuts off.. ?? Hope this line of thinking helps you out md
There are any number possibilities for intermittent running. 1.Bad ground connection at the Ignition Device (transformer, spark box) 2.restricted fuel filter causing fuel starvation 3.crack in the plastic end cover 4.crack in the airline 5.crack in the fuel line 6.crack in the nozzle adapter 7.water in the fuel 8.Others I’m sure I left out You must be the one to troubleshoot & find the cause. Follow these troubleshooting tips