Replace Variable Speed Pump. Shut off water flow, drained portion of piping so I could remove pump. Unwired old pump then mounted new pump and wired it to system. Used pressure tool to increase pressure and bleed out air in lines. Burped Pump then opened up water valves. Returned power to system and ran pump by itself to test and circulate water to ensure all air was removed. Ran heat and checked operation. Unit operating normal at this time. Customer let me in to perform service but left shortly after. Once finished with repair I got confirmation to use card on file for 2nd half of payment. Locked up cellar and back door for customer.