Yellow flame on Plastimo stove

joliette

joliette

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One of the burners on my Plastimo Neptune 3000 (about 10 years old) has started to burn with a yellow flame and produce black carbon deposits. Any idea what causes this and is there anything I can do to correct the problem, without buying a new stove?
 
joliette said:
One of the burners on my Plastimo Neptune 3000 (about 10 years old) has started to burn with a yellow flame and produce black carbon deposits. Any idea what causes this and is there anything I can do to correct the problem, without buying a new stove?
Click to expand...

air / gas mixture is the probable cause. is there an adjuster device under the hob on that burner
 
The gas is burning rich. i.e. with insufficient air. This is dangerous, as incomplete combustion produces Carbon Monoxide, which is lethal. Somewhere in the burner, an air inlet is blocked.
 
If the burners are the same as the 2000, they have a small allen screw on the edge, holding them in place. With that slackened the burner will lift off and just cleaning it may solve your problem.
 
It's unlikely that the mixture control has shifted so I would suggest just a thorough clean and de-rust/scale will restore it to its former condition.
 
joliette said:
One of the burners on my Plastimo Neptune 3000 (about 10 years old) has started to burn with a yellow flame and produce black carbon deposits. Any idea what causes this and is there anything I can do to correct the problem, without buying a new stove?
Click to expand...


All the above and also it could just be a few spiders have got in the airway. Just clean out and your set for another ten years.
 
I had this with an old stove, so I contacted the manufacturer (not Plastimo but Leisure Products, Bolton). They explained that quite often the problem is that when you clean the drip tray, the muck goes into the secondary aeration gap below the burner. The burner has pips of ridges to hold it very slightly off the mount to allow air to be drawn into the final mix. To effect a repair, unscrew the burner and clean thoroughly. The later Plastimo manuals suggest this should be an annual preventive measure.

If you don't keep the gap clear, the flame will burna yellow and begin to stand off - a gap between the burner and flame - and then will tend to refuse to burn at all the jets simultaneously.

Rob.
 
Bosun Higgs said:
Most likely shortage of air. But you will get a yellow flame is there are any sodium salts near the burner eg sodium chloride or common salt.
Click to expand...

That is true but the OP complains of soot deposits... That indicates a shortage of air rather than sodium salts.

Sodium flame I would say is a little more orange than the soft yellow flame caused by incomplete combustion.
 
I had just this problem (Plastimo Neptune 2000). Little Allen screw had seized but I managed to get the diecast circular thingy off anyway. Lots of muck below it which I removed. Reassembled. Now burns perfectly.

Looked at other burner which had been burning OK. This time the little Allen screw hadn't seized; unscrewed it a bit, lifted thingy off, found muck although not so much, cleaned up, reassembled, re-tightened Allen screw.

My old stove now works perfectly. Blue flame.

While you are at it - an expert will be along in a bit, but it seems to me a good idea to check that the flame failure devices work on all burners (grill and oven as well), that the main gas tap (on cylinder) really does turn off (ie stove will not burn or re-light with it off) and that there are no leaks. Seems to me that if you have been using stove, then turn off all taps on stove and then also main tap, leave for a while, open one burner tap (main tap still off) and relight, observe that it lights and burns for a few seconds then goes out; there are probably no leaks.
 
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