Performed heating maintenance on one heat pump system. Checked all electrical, mechanical and performance of the system. Cleared and treated the drain line and washed the outdoor coil. As I was checking, refrigerant pressures, I noticed that the compressor was not working and had shut off on thermal lockout.I cooled off the compressor and I found that the compressor start assist had failed the compressor was pulling 98 amps on start. I installed new start assist. Start amps are at 35 rated for 95. The compressor running amps are at 12 rated for 15 maximum. I cycled power and the system is now working at this time.