Operates 5 seconds then burner goes off

To adjust the pump pressure on this type of heater, turn the threaded adjuster clockwise to increase the air pressure, but if the adjustment makes no difference, there maybe a loss of air pressure caused by a crack in the plastic filter end cover, the rubber seal at the end of the nozzle may be broken, gone hard, cracked or missing, there could be a crack in the burner head (where the nozzle screws in), leaking air supply pipe between the compressor and the burner head, the rotor and/or blades may be worn or damaged, or if contaminated with dirt,paint spray or oil, one or more blades may be stuck in the rotor If contaminated they will need to be replaced, but if doing so, remember to reset the clearance between the top of the rotor and the pump body, your manual will give you the correct clearance.

Vaporized propane sounds just like air coming through a hose. Turkey fryers use a different regulator than a standard barbecue which uses a low pressure -- 11" water column displacement. Pressure for a BBQ is measured in displacement because LP pressure is very low, less than half one pound PSI. Turkey fryers use a higher pressure so more gas is able to feed to the burner but the regulator diaphragm adjusts because of the adjustment wheel. However, before determining the regulator needs to be replaced, adjust the air shutter on the venturi and ensure the orifice is clear. LP must be mixed with air in the burner in order to burn but if the shutter is open too much we can hear air-flow and too much air can definitely cause that sound and cause flames to blow out. We have a video at you---e showing the adjustment with too much air blowing-out the flames. First check your connections and orifice to make sure there are no leaks or impediments. Second restart the burner with the air shutter almost closed and continue making adjustments -- while burning if possible. If neither of those work replace the pressure regulator. Most people will initially say replace the regulator but they do not go bad as often as many think; a regulator is only a open space that limits him much gas can travel through at any time.

If you have a Karcher then you should always post your machines barcode.

full article on nozzles :
http://repairshed.blogspot.com/2013/09/pressure-washer-lance-nozzles-what-you.html

The spill valve operates at approx 20% higher than specified pressure washer operating pressure. If you have any lance issues then the pressure could be running higher than specified (machine running at same pressure as spill valve operation pressure)

your machine produces a fixed flowrate of water (maybe 8 litres per minute) and your nozzle is a fixed size. the diameter of the nozzle determines the back pressure. A piece of debris could further close your nozzle orifice and increase the back pressure. Using a new lance that has the wrong nozzle fitted can also cause this issue.

The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

I am not sure what to tell you, other than go to Colman's website for a manual. That will at least give you a parts list if you ever need it. But, these stoves are generally solid and reliable, with few things to know about.

What I do to operate:

1. Set up stove: lid up and wings out, tank fully pumped (works best if no more than about 2/3 to 3/4 full) and installed with nozzle firmly into the socket above the right burner.
2. Little lever on left of valve assembly--turn upward. Open valve a little bit to get fuel flowing to burner. Give it just a few seconds then light burner with match or lighter (watch your fingers!). It should light off pretty readily.
   
3. Open valve a fair bit (anti-clockwise) and let it burn for up to a minute until the flame changes from yellow to mostly blue, and mostly around the burner and not up in the air. Turn little lever on left of valve downward.
   
4. Re-pump tank to maintain pressure.
   
5. Use valve knob to adjust flame intensity, and cook away.
6. To use second burner, the key thing os to remember that it draws from the same valve, so when it is on the main burner goes down a bit.
   
7. The knob for the 2nd (left) burner is a little flip-out on the left end of the stove. Open slightly, and light the burner. Only do this after the main (right) burner is burning blue.
8. Use the main valve (on the tank) to adjut the total fuel flow, and the little handle for the left burner to adjust how much of the total flow goes to the left side. (You cannot burn the left without the right being on.)
9. Pump as required to maintain pressure.
10. The only real "part" that you might have to strip or replace is the "generator" which is the tube from the valve across the top of the right burner. The liquid fuel is vaporized in there, and is what needs to get warmed up when you start.
    

Many newer grills have a safety feature built in where the valve will not
allow gas to flow if the burner valve is in ON position when the valve on
the tank is opened.

Try this - Shut of all valves, disconnect and then re-connect hose to tank,
turn on valve above LP tank, THEN turn on burner valve, light w/ spark or
match...

This feature can be really frustrating if you don't know it is in
operation...

Hello, this is a strange story.
I had this a few times in the opposite and then I found that it was a LPG cooker in stead of a natural gas cooker.
Did you buy this cooker second hand and did not use it before?
When this cooker is normally natural gas, then the nozzles are much larger then when used for LPG, as the pressure of LPG is much higher as for natural gas.
In that case you can change the nozzles for LPG use
Is this a dual fuel cooker with electric oven?

Kind regards, Dik
LPG Jets Cookers Ovens Hobs eBay

Hi Please check your oil zzle is not blocked at all. Remove the burner head and renew the nozzle. If that fails you will need to check the fuel pressure from your fuel punmp which should be at least 9-10 bar.

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

Too much air. Adjust the air shutter.

HI ,
Align the burner to gas nozzle at the back side cover , if still ajusment make it closer nozzle to burner so that gas will not spell out,