Yellow Flame on your Oil Aga?
If your Oil Aga Cooker has a yellow flame, or is sooting up, it needs some intervention.

Firstly, turn your cooker off!
A yellow flame is a sign that something is wrong, and with oil, it's always better to be safer than sorry. Also make sure you have a working carbon monoxide detector by the Aga.
When running correctly, your oil burner should have a lovely blue flame above the burner shells, when you look through the glass viewing window.
In recent years, we've seen considerably more issues with oil-burning Aga Cookers, resulting in more frequent servicing, or issues with the correct burning of oil. Most issues have been with oil quality and blocked filters. We've found that the best thing for your Aga cooker is standard 28-second kerosene (no additives), delivered in as few deliveries per year as possible.
To highlight the temperamental nature of Oil Aga Cookers, some have been running perfectly well for decades with "Certas GlowMax" oil (it used to be recommended by AGA back in the day), but others have immediate issues whenever any additives are introduced.
If you're having issues after a delivery of oil, the new delivery may have stirred up sediment/water in your tank, so you may need a service to clear things out (and your oil tank filter!). You should let your tank run down to around 20% empty before filling up.
If your Oil Aga cooker has a yellow flame, the most likely causes are:
- Burner shells not seated into the burner correctly.
- Lighting flap on your burner shells incorrectly closed.
- Vaporising chamber lid on top of shells not seated correctly.
- Center plug not seated correctly (some are sealed with fire cement to prevent any air ingress).
- Burner base had become unlevelled.
- Wicks reseated incorrectly.
Your burner must be cool before relighting.
You'll need to clear out the soot from the flueways before trying to light, otherwise the downdraught can be impeded and cause similar issues.
As a minimum:
- Burner chamber cleared of soot.
- Boiling plate taken out and barrel cleared of soot.
- Simmer plate taken out and flueways hoovered out.
- Flue baffle taken out and flue cleared of soot.
There are a few things to check before relighting:
- Check that the burner shells are fully seated correctly inside the burner.
- Check the top lid on burner shells seated correctly.
- Check centre chamber plug seated correctly (some are sealed with fire cement to prevent air ingress).
- Check burner is level after reseating it back into the ashpit.
- Check elbow isn’t leaking after reconnecting it to the burner.
- Burner is thouroughly cleaned (centre well, flow channels and wick recesses cleared of any carbon or deposits).
We'd always recommend a visit from a qualified aga-trained engineer, rather than a DIY, but hopefully the information above is helpful.
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