交流接触器是否损坏：查看触点是否损坏，接触器吸合是否正常。(图6左)。

The contactor whether damaged: check the touch point whether is normal or not, the contactor which suction or close whether is normal or not (with the picture 6 left).

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用导线将温控器的触点短接试机，制热正常。

With wires of the thermostat contacts short sub commissioning, heating normal.

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当装置冷却到安全工作温度时，触点自动闭合，恢复正常工作状态。

When installed cooling to a safe temperature, contact automatic closure and a return to normal working condition.

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