Repair: system is approximately 3.5 lbs low on r410a refrigerant. Ther could also be restrictions in the liquid line, but am unable to determine that with the current refrigerant charge. For the heaging equipment, the heat sequencer is intermittently failing to connect the low voltage control to activate the heat strip. The air handler and heat kit are in poor condition due to rust and age on the system. Replaced heat kit, system is achieving 22 degree temperature rise in heat. Amp draws are in range at this time.