Hello, We have a problem with the truck BT SWE 160D No. 722803. After connecting the power supply (battery) starts to heat up PTC resistor located on the contacts of the main contactor K10. When you enter the boot codes appear in the display error C28, not attached to the main contactor. Emergency switch, power cords, fuses are intact. After disconnecting the cables from the motor drive, the controller starts normally, does not display any error, the contactor shall be attached. The engine also does not break (shorting). Please help because no one with whom I spoke, did not meet with this type of defect.
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