I'm no composting expert (my hotbin doesn't run hot!) but that sounds to me like too much green material and not enough brown.
Like you, I use mine mostly for kitchen waste (only vegetable, and nothing cooked) as I have other compost heaps for garden waste. It does produce useable compost but only very slowly and rather sloppy (I mix it into potting compost for hungry plants like dahlias and cannas), and I'm pretty sure it's because I don't mix in enough brown material.
Humiliatingly while I was putting some seedlings in the greenhouse, the neighbour appeared from over the fence and wanted to know what the terrible smell that had been lingering for days was. I explained, apologized profusely (apologies not accepted) and promised to sort it out asap. I have now shovelled it into the compost bin, shovelled up that which I put under the raspberries to the best of my ability (not good enough, I fear) having mixed it with old shop bought compost and left the lid ajar slightly. I hope this works, but I fear it might take a while. I am a bit cross as I now have a painful back and I had used up today's energy already (I have some post viral possibly Long Covid thing going on) so shattered now and not enough left to do the job I was about to do. But of course I could have waited until tomorrow, so my own fault.
Going forward, as business types are want to say, I shall follow the Hotbin manufacturer's advice:
"What do I do if my compost smells rotten? If the compost in the HotBin starts to turn anaerobic, immediately stir in small pieces (not sheets) of corrugated cardboard (to absorb excess water) and wood chip bulking agent (to help re-aerate the heap)."
Brown corrugated cardboard (torn up packaging boxes etc) will do the job, or even sheets of newspaper scrunched up loosely. No need for expensive special stuff.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Don't you add shredded paper or other 'browns' when you put a load of kitchen waste in? It's supposed to be pretty much equal amounts, plus a bit of the composted bark. I don't bother with the bark now as there's enough compost in there to work as a 'starter' but always have a load of shredded paper or cardboard to hand when adding a bin of kitchen waste.
'If you have a garden and a library, you have everything you need.'
A nice mix of both types of material is what you need @REMF33, regardless of the type of bin. That gets the balance right, although it isn't an exact science, just get roughly equal amounts of both
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
What is brown kitchen waste, @borgadr ?!? Ironically there was literally a lot of brown in the form of coffee papers and grounds!
Sorry I didn't spot your question, but @JennyJ answered it - carbon-rich dry or woody material (not from your kitchen!) which could be cardboard, wood/bark chippings, newspaper etc. As opposed to nitrogen-rich greens.
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Like you, I use mine mostly for kitchen waste (only vegetable, and nothing cooked) as I have other compost heaps for garden waste. It does produce useable compost but only very slowly and rather sloppy (I mix it into potting compost for hungry plants like dahlias and cannas), and I'm pretty sure it's because I don't mix in enough brown material.
Ironically there was literally a lot of brown in the form of coffee papers and grounds!
I hope this works, but I fear it might take a while.
I am a bit cross as I now have a painful back and I had used up today's energy already (I have some post viral possibly Long Covid thing going on) so shattered now and not enough left to do the job I was about to do. But of course I could have waited until tomorrow, so my own fault.
Going forward, as business types are want to say, I shall follow the Hotbin manufacturer's advice:
"What do I do if my compost smells rotten? If the compost in the HotBin starts to turn anaerobic, immediately stir in small pieces (not sheets) of corrugated cardboard (to absorb excess water) and wood chip bulking agent (to help re-aerate the heap)."
https://www.hotbincomposting.com/bulking-agent-woodchip/bulking-agent-woodchip.html
I live in west central Scotland - not where that photo is...