The sump pump installed 2 years ago is found to malfunction. During downpour, I can see water receding back all over the basement… When does this happen? Should I go for a complete replacement of the sump pump?

Does the pump run? Plugged in? Drain hose open? You say water receding. That means it is going away??

Make sure the float is not stuck in CLOSED position. Pull the float up with stick. See if the pump activates. Also, you may have debris on the bottom of the pit, preventing pump rotor to activate. Make sure the pump sits on couple of bricks and that you clean the pit with hose at least once a year

Last, check on electrical. If the pump is connected to GFCI outlet, it may have tripped anyplace on the circuit

Hope that helps

Milo