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Gas fires need servicing sometimes to remove the natural build up of dust, fluff and carbon and it is probably this that is causing your trouble.
Service engineers will remove the radiants and vacuum the burner(s), the mixing chamber and check the gas jet(s) are clear, the gas pressure is correct and there are no leaks.
Using a vacuum creates less mess but it doesn't always get to the heart of the trouble and many fires that have been condemned as being worn out often need stronger medicine - should fluff be partially blocking the air supply to the mixing chamber the gas/air mixture will become gas-rich and the flame will create soot, sometimes lots of soot that vacuuming doesn't shift.
The careful application of a compressed air jet does tend to move lots of soot...
Hi, I would say that you have a build up of soot. Kerosene and propane heaters are notorious for this, you wouldn't think so but it happens a lot.Carbon up and soot.You will have to open it up, the combustion chamber and give it a good cleaning. I would wear a dust mask as soot as i am sure you know, will get on and in everything. Please let me know how it goes and if this solves the problem. Good Luck, Shastalaker7
If you have a lot of black smoke then its over fueling getting to much diesel to the cylinder's. Sounds like an injector problem with the slight knocking noise. Che ck the return pipes are not blocked. If the smoke is dark brown then this is a problem with the valves on the intake manifold which control's the intake of exhaust emmisions.
soot?
i would have to ask if you using naturasl gas or lp from a bottle
soot is usually from the heater if your set up for the wrong gas you dont get a clean burn and soot is deposited in the dryer
Is this on LP or Natural gas? If LP was it converted to LP? In any event,The air shutter must be adjusted on the gas burner tube. You need more air. The valve orifice may also need adjusting.
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