If the contactor to send continuous "da, da, da" noise, falling into the foreign body may be due to the contactor in the contactor iron core can not pull

If contactor closed after a continuous, Click, Click'"'noise, and may be due in contactor fallen iron core material makes contactor cannot be properly closed

If after the contact device attracts gathers sends out continual “clip clop, clip clop, clip clop” noise, possible because the contact device declines into the foreign matter to cause the contact device ferrite core to be unable to attract normally gathers

If the contactor emitted after pull-in consecutive "da, da, da" noise, may be due to contact in the hands of foreign body makes contactor cores cannot be normal suction

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