To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.
Check wiring between HPTCM and contactor. Look for shorted wire between HPTCM and contactor terminals A1 and A2.
Measure resistance between A1 and A2 terminals. The resistance should be about 289 Ω. If contact is measuring less than 100 Ω, then the contactor is shorted and should be replaced.