Received a call that the unit that serves the apartment for Alexander House was not cooling, upon arrival I noted that the condenser was not running but the air handler is and the thermostat is calling for cooling. I confirm that the circuit breaker is on and checked power at the disconnect, the disconnect has power going in and out of it. I traced the power to the generac switch and found that the contactor is not pulling in all the way disconnecting the power to the condenser. I bypassed the contactor in the generac box to get the unit running and we informed the electrician that he will need to replace the generac box. The unit is operating at this time.