Open the electrical cover on the top of the cartridge of the pump using the 6-in-1 screwdriver.
Disconnect the electrical wires from the pump.
If possible, valve off the circulator pump. If valves were not provided in the original installation, drain down the boiler using the boiler drain at the bottom of the boiler and the garden hose.
Loosen and remove the four bolts on the two flanges holding the circulation pump in place and remove the pump.