Bunn 41722.0000A manual Probable Cause Remedy, Brew cycle will not start No water, To the brewer

Page 4

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 volt ac and low voltage dc potential on their terminals. Shorting of terminals 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.

Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are energized for more than ten minutes without a supply of water.

The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help to avoid twists and kinks in the tubing.

Make certain that all plumbing connections are sealed and electrical connections tight and isolated.

This brewer is heated at all times. Keep away from combustibles.

WARNING

Exercise extreme caution when servicing electrical equipment.

 

• Unplug the brewer when servicing, except when electrical tests are specified.

 

• Follow recommended service procedures

 

 

Replace all protective shields or safety notices

 

PROBLEM

 

PROBABLE CAUSE

REMEDY

Brew cycle will not start

1.

No water

 

2.

No power or incorrect voltage

 

to the brewer

Water lines and valves to the brewer must be open.

(A1) Check the wire crimps for

120 volts across the black and white terminals on two wire 120 volt brewers.

(A2) Check the wire crimps for

200 volts on "B Series" brewers or 230 volts on "A Series" brew- ers across the red and black terminals.

(B)Check circuit breakers or fuses.

Page 4

41722 070209

 

Image 4
Contents TB3/TB6 Series Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Contents Brew cycle will not start No water Probable Cause RemedyTo the brewer Problem Brew cycle will not start Water is not hotProbable Cause Control Thermostat Tank HeaterInconsistent beverage level Surfaces can initiate corrosiveReactions resulting in serious LeaksSpitting or excessive steaming Dripping from sprayhead Refer to Service Timer for test- ing proceduresBeverage overflows dispenser Funnel Brewer is making unusal noises Dry coffee grounds remainPlumbing Lines Water Supply Brewer is making unusal noises Tank Heater Problem Probable Cause RemedyCont Tank heater Control Thermostat Component AccessLocation Control thermostat is located in the hood Disconnect the control thermostat wires Adjust the control thermostat as requiredRemove all wires from limit thermostat termi- nals Limit ThermostatTank Heater Disconnect the brewer from the power supply1680W-120V 1680W-100V 1680W-230V 29.0 33.7 Refer to -2 when reconnecting the wires Lighted ON/OFF Switch TB3/TB3QOrange light Switch is located on the front control panel Through four when the switch is in the oposite PositionSwitch If continuity is present as described, replace the wiresStart Switches 37080.0001to T. StatInlet Valves BREW/DILUTION Timer TB3 & TB6 BREW/DILUTION Timer Triacs Triacs TH-1/MV-1 Brew solenoid TH-2/MV-2 Dilution solenoidTerminals ½ batch connector Digital Brew Timer TB3Q & TB6QWhite Red Neutral L2 Digital Timer Triacs Triacs MV-2 Brew solenoid output MV-1 LineSchematic Wiring Diagram TB3Q Volts AC Wire Single PhaseSchematic Wiring Diagram TB3, TB3B, TB3-LP Schematic Wiring Diagram TB3Q Schematic Wiring Diagram TB3Q W/SWEETENER & Empty BAG Detect Schematic Wiring Diagram TB6 Schematic Wiring Diagram TB6Q