Grindmaster 250AB Problem, Possible Cause, Solution, Page, 115 & 250 Series Coffee Grinders

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	• Readjust fine grind setting, see “To
	grind setting	Adjust Fine Grind” section
Rumbling noise	• Thrust bearing rotating inside flange	• Replace thrust bearing and shear cap
	bearing
Chattering or buzzing noise	• Solenoid may have failed to seat or	• Check alignment of solenoid and
	close fully (Models 115AB &	shift arm
	250AB only)	• Also check the tightness of the solenoid
		mounting screws
Loud vibration noise during grinding	• Cotter pin in the thumb screw linkage	• Attempt to spread flanges of cotter pin
when Grind Selector™ is not activated	may be vibrating	or replace cotter pin
Grind Selector™ fails to activate	• Wiring harness loose	• WITH MACHINE UNPLUGGED, check
		wiring harness connections to see if
		they are secure on the timer terminals
	• Solenoid has burned out (Models 115AB	• Replace solenoid
	& 250AB only)

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.

Page 9 115 & 250 Series Coffee Grinders