Troubleshooting Guide for Grind Selector™ Mechanism (Models 115AB and 250AB)
The following procedures must be performed by a qualified service technician.
PROBLEM | POSSIBLE CAUSE | SOLUTION |
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Loud grating noise. | • Burrs are touching each other on | • Readjust fine grind setting, see “To |
| fine grind setting. | Adjust Fine Grind” section. |
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Rumbling noise. | • Thrust bearing rotating inside | • Replace thrust bearing and shear |
| flange bearing. | cap. |
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Chattering or buzzing noise. | • Solenoid may have failed to seat | • Check alignment of solenoid and |
| or close fully. | shift arm. |
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| • Also check the tightness of the |
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| solenoid mounting screws. |
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Loud vibration noise during | • Cotter pin in the thumb screw | • Attempt to spread flanges of cotter |
grinding when Grind Selector™ | linkage may be vibrating. | pin or replace cotter pin. |
is not activated. |
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Grind Selector™ fails to | • Wiring harness loose. | • WITH MACHINE UNPLUGGED, |
activate. |
| check wiring harness connections to |
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| see if they are secure on the timer |
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| terminals. |
| • Solenoid has burned out. | • Replace solenoid. |
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If you still need help, call our Service Department at (800)
Prior authorization must be obtained from Grindmaster Corporation’s Technical Services Department for all warranty claims.
Page 9 | 115 & 250 Series Coffee Grinders |
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