The unit runs just fine, drain pipes are perfectly clean, but sink water will fill it up and will only drain copletely and wuickly when the motor is turned on. There is nothing inside the unit to grind, but will not drain by itself without the motor running. The motor sunds perfectly normal. Dont have model #, but the unit is 22 yrs old, and has only been used occasionaly.I would appreciate your advice, running out of ideas on my own.Thanks.
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