If you’re judging your AGA’s temperature from thermometer on the outside, be aware that these gauges are only a guide to the temperature inside. Also, mercury has been banned since April 2009 so gauges now use a bright blue alcohol mix which isn’t as accurate as mercury, making it an even more approximate guide.
You may also have an issue where your AGA is hot on the outside but seems cold inside, in which case the visual guides may look about right, but you still have a problem. This is likely to be an issue with the internal insulation having settled which can can happen in older AGAs or ones that have been moved.
The best way to check if your oven really isn’t performing correctly is to place an oven thermometer half way back on the middle shelf of your roasting oven. It should read 235dC. If it’s cooler than this, make sure the flue and burner areas are clean and free of dust. Read our tips on AGA cleaning for more information. If that isn’t the issue, or you have an electric AGA whose heating element has stopped working, give us a call and we’ll quickly diagnose your issue and repair your AGA and have you cooking delicious food again in the way only a range cooker can.