Bunn G9WD-RH service manual Troubleshooting, Problem, Probable Cause, Remedy

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 qualified service person- nel.

•All electronic components have 120 volts ac and low voltage dc potential on their terminals. Shorting of terminals or the application of external voltage may result in board failure.

•Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. Of 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 specified.

•Follow recommended service procedures.

•Replace all protective shields or safety notices.

Problem	Probable Cause		Remedy
Grinder will not start	1.	Motor overload protector	Remove the metal plug located
			on the right side of the housing.
			Press the red “Reset” button. Lis-
			ten carefully for a “click”. This re-
			sets the motor protection circuit
			and indicates that the motor may
			have encountered an overload. (An
			overload can occur when some-
			thing other than coffee is inserted
			into the hopper for grinding)
	2.	No power	Check the voltage at the power cord
			with a voltmeter. Voltage must be
			120 volts across the black and
			white wires.
	3. START button		Use	“TEST	SWITCHES?”	menu
			under	“SERVICE TOOLS?”		menu
			in level 1 functions to test START
			button.
	4.	Circuit board	Circuit board.		Check that there is
			24VDC to the relay coil when the
			Start button is pressed.

13 41451.0001 111909