Using this Invensys oven thermostat is quite simple. First, make sure your oven is turned off and unplugged. Then, carefully install the thermostat according to the mounting instructions, using the 1/2' threaded mounting and the 6mm D - shaped shaft. Connect the 6.4mm spade terminals as indicated. When using, set the desired temperature between 70 and 290 degrees Celsius. The fan and auxiliary switches will work automatically to maintain the right temperature. For safety, always keep the oven and thermostat away from water and excessive moisture. If you notice any unusual behavior like incorrect temperature readings, don't try to fix it yourself. Instead, contact us. To keep it in good condition, clean it gently with a dry cloth every few months. This will help it last a long time and keep your oven working well.