Grindmaster 250RH-3 - Manual (Page 10)

Page 9 115 & 250 Series Coffee Grinders
If you still need help, call our Service Department at (502) 425-4776 or (800) 695-4500 (USA & Canada only)
(Monday through Friday 8am-6pm EST) or an authorized service center in your area. Please have the model
and serial number ready so that accurate information can be given.
Prior authorization must be obtained from Grindmaster Corporation’s Technical Services Department for all
warranty claims.
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
Loud grating noise • Burrs are touching each other on fine
grind setting
• Readjust fine grind setting, see “To
Adjust Fine Grind” section
Rumbling noise • Thrust bearing rotating inside flange
bearing
• Replace thrust bearing and shear cap
Chattering or buzzing noise • Solenoid may have failed to seat or
close fully (Models 115AB &
250AB only)
• Check alignment of solenoid and
shift arm
• Also check the tightness of the solenoid
mounting screws
Loud vibration noise during grinding
when Grind Selector™ is not activated • Cotter pin in the thumb screw linkage
may be vibrating
• Attempt to spread flanges of cotter pin
or replace cotter pin
Grind Selector™ fails to activate • Wiring harness loose
• Solenoid has burned out (Models 115AB
& 250AB only)
• WITH MACHINE UNPLUGGED, check
wiring harness connections to see if
they are secure on the timer terminals
• Replace solenoid