Error 7 my wrong maschin dont work when i turn kay hi sey error 7 and dont work nothing

Incline calibration is necessary when: the display shows ERR7, the drive board incline error LED ( LED5) lights or the incline has extended beyond its normal rangeThe goal of calibration is to synchronize the incline set mechanically and electronically. Mechanical calibration sets the incline motor pipe to the 0% position. This happens when the red line on the thin pipe is even with the end of the thick pipe. Electronic calibration sets the variable resistor (VR) value to the 0% position. This happens when the voltage across the VR blue and green wires is 1.20 VDC.
Readings of VR voltage (blue and green wires) should show around 1.20 VDC at the lowest position and around 3.80 VDC at the highest position. If the VR looses calibration or cannot be set to 1.20 VDC, replace the VR. If the incline motor gets voltage from the drive board but fails to operate, replace the incline motor set. If the incline fuse blows again and again, replace the incline motor set.