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You do not need a warranty card for your warranty to be valid. Your installing contractor provides the labor warranty and the factory provides the warranty on parts. All the necessary information to make a (parts) warranty claim is embedded in the serial number of your unit. As for a manual you should contact the installing company or visit the Weatherking (Rheem) site to request this information. www.weatherking.com
Even when the power is off at the unit outside the thermostat will supply power to the contactor of the outside unit. This may give a hum or buzz as you stated. If when the power is on to the outside unit the fan tries to start but only hums the motor may be bad. Does the compressor start and run?