Bunn MHG Service & Repair Manual

10
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection,testing,andrepairofelectricalequipmentshouldbeperformed only by qualied service
personnel.
• Allelectroniccomponentshaveacvoltageanddcvoltagepotentialontheirterminals.Shortingofter-
minals or the application of external voltages may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.
If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection
at a terminal or crimp.
• Makecertainthatallelectricalconnectionsaretightandisolated.
WARNING
 • Exerciseextremecautionwhenservicingelectricalequipment.
 • TurnpowerOFFwhenservicing,exceptwhenelectricaltestsarespecied.
 • Followrecommendedserviceprocedures.
 • Replaceallprotectiveshieldsorsafetynotices.
Problem
Grinder will not start.
Remedy
(A) Plug-in the grinder.
(B) Check the voltage at the wall
outlet with a voltmeter. It must be
120 volts ac for 120 volt models,
100 volts for 100 volt models, and
230 volts for 230 volt models.
(A) Momentarily press the Off/On/
Start switch to the “START” posi-
tion.
(B) Refer to Service - Off/On/Start
switch for testing procedures.
Press the “Reset” button, located on
rear of the grinder. Listen carefully
for a “click”. This resets the motor
protection circuit and indicates that
an overload may have been encoun-
tered by the motor. (An overload can
occur when something other than
coffee is inserted into the hopper for
grinding). Refer to Service - Circuit
Breaker for testing procedure.
Refer to Service - Timer for testing
procedures.
Probable Cause
1. No power or incorrect voltage
2. Off/On/Start switch
3. Circuit Breaker (Not applicable on
Model LPG with capacitor)
4. Timer
41545 122209

Bunn MHG Specifications

General

Brand	Bunn
Model	MHG
Category	Grinder
Language	English