Posted by jtown on December 21, 2000 at 06:53:55:
In Reply to: Circulation pump posted by David on December 21, 2000 at 05:25:34:
Are you sure it's not a relay humming. A voltmeter would show that you have juice to the pump, or have someone feed power directly. If you said what brand/model of pump would help. Separating a 3pc pump would show if the impeller is binding vs bearing ass'y.