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Motor Lack Phase Due To What?

Power supply:

(1) switch contact bad;

(2) the transformer or a line break;

(3) the fusing.


Motor connection:

(1) electrical junction box screws loose contact;

(2) internal wiring bad soldering;

(3) motor winding wire.


Motor vibration and sound due to what?

Mechanical aspects:

(1) the lubrication of bearings, bearing wear;

(2) bearing too large.

(3) fastening screws loose;

(4) motor with debris.