I'm having a problem with a Lennox 110AC B24-6P A/C. The unit does not power up. The breaker is fine the thermostat is fine and the capacitor looks OK.
When I push in the Contactor-Relay it rattles but does not power up and there is a humming sound near the Contactor-Relay. Does this mean that the Contactor-Relay is not making a good connection and isn't closing the circuit. Does it need to be replaced