Poor contact of power supply. Intermittent heating of Chang Di electric oven is caused by internal components, which leads to poor power contact. You can ask a professional master to open it for inspection. Chang Di, a brand of household electric oven, is a one-stop service provider of household baking service. Since 1993, we have been focusing on the research, development, production and sales of household appliances such as electric ovens, and launched a variety of desktop electric ovens, embedded ovens and a series of kitchen appliances and baking tools.