Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn U3A service manual Remedy, TROUBLESHOOTING cont PROBLEM, Probable Cause

Models: U3A U3

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TROUBLESHOOTING (cont.)

PROBLEM

Tank not filling

Water running out of the over- flow

PROBABLE CAUSE

1.ON/OFF Switch (This switch must be in the "ON" position for the refill circuit to operate.

2.No water

3.Solenoid Valve

4.Probe

5.Liquid Level Board

1.Brewer not level

2.Solenoid Valve

3.Liquid Level Board

4.Probe

5.Manual fill and drain valve un- derneath brewer open.

REMEDY

Refer to Service - ON/OFF Switch for testing procedures. See page 22

Be sure water shut-off is open and that in-line filters or strainers are not blocking water flow. (Do not confuse water shut-off valve with the manual fill and drain valve underneath brewer).

Refer to Service - Solenoid Valve for testing procedures. See page 27

Refer to Service - Probe for testing procedures. See page 20

Refer to Service - Liquid Level Board for testing procedures. See page 20

Brewer must be level and installed on a sturdy structure.

Refer to Service - Solenoid Valve for testing procedures. See page 27

Refer to Service -Liquid Level Board for testing procedures. See page 20

Refer to Service - Probe for testing procedures. See page 20

Be sure valve is closed.

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Bunn U3A service manual Remedy, TROUBLESHOOTING cont PROBLEM, Probable Cause

Contents

U3 U3A OPERATING & SERVICE MANUALBUNN-O-MATIC CORPORATION BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY PageATTENTION TURN OFF WHEN UNATTENDED INTRODUCTIONUSER NOTICES Very Hot Water Use With CareELECTRICAL INSTALLATION INSTRUCTIONS ELECTRICAL REQUIREMENTSCE REQUIREMENTS INITIAL SETUPPLUMBING REQUIREMENTS ADJUSTING BREW VOLUMES INITIAL SETUP contVolumes COFFEE BREWING CLEANINGFILTER HOLDER PROBLEM TROUBLESHOOTINGPROBABLE CAUSE TROUBLESHOOTING cont PROBLEM PROBABLE CAUSETROUBLESHOOTING cont PROBLEM REMEDYPROBABLE CAUSE PROBABLE CAUSE TROUBLESHOOTING cont PROBLEMRefer to Service - Contactor for testing procedures. See page REMEDYPROBABLE CAUSE TROUBLESHOOTING cont PROBLEMFunnels overflow cont Coffee reservoir overflows REMEDYCOMPONENT ACCESS SERVICEContents SERVICE cont Wire Models and 440V Four Wire ModelsSERVICE cont CONTACTOR2A. 120/208V, 120/240V, 380V THREE WIRE MODELS Tank Heater SERVICE cont CONTACTOR contBLK to Right Tank BLK Thermal Fuse to Right Tank Heater BLK to Terminal Block L1Install thermostat and mounting bracket on the SERVICE cont CONTROL THERMOSTATDisconnect the wires from the control thermo FIG. 6 CONTROL THERMOSTATFIG.8 FUSE AND FUSE HILDER SERVICE contFIG. 9 FUSE HOLDER TERMINALS Disconnect the brewer from the power source SERVICE cont LIMIT THERMOSTATWith an ohmmeter, check for continuity across SERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE VoltageSERVICE cont LIQUID LEVEL BOARD AND LEVEL PROBE contRED to Start Switch, Brew Timer & Liquid Level Board SERVICE cont ON/OFF SWITCHFIG. 15 ON/OFF SWITCH TERMINALS SERVICE cont PUMP ASSEMBLY SERVICE cont RELAY BREWERS W/BREW LOCKOUT SERVICE cont RELAY BREWERS W/BREW LOCKOUT BLU fromSERVICE cont SELECTOR SWITCH HALF BATCH OPTION SERVICE cont SOLENOID2. A For 120/208 volt and 120/240 volt three wire, single phase models, 380 volt three wire, three phase models and 380 volt, 440 volt four wire, three phase models, disconnect the black wire from the liquid level board #2 and the white wire on the solenoid. With a voltmeter, check the voltage across the black and the white wire. Connect the brewer to the power source. The indication must be SERVICE cont SOLENOID SERVICE cont START SWITCH BREW FIG. 24 START SWITCH BREWLEFT SERVICE cont TANK HEATERSFIG. 27 TANK HEATER TERMINALS TIMER Early Models SERVICE cont THERMAL FUSES 230V-CE MODELS ONLYFIG. 28 THERMAL FUSES SERVICE cont TIMER Early Modelscont To Three Pin FemaleSERVICE cont DIGITAL TIMER Late Models NOTE Half-Batch and full batch settings must each be set separately SERVICE cont DIGITAL TIMER Late ModelsNOTE All volume settings must be done with the sprayhead installed FIG. 33 DIGITAL TIMER TERMINALSTRANSFORMER 380V THREE WIRE MODELS ONLY SERVICE contFIG. 35 TRANSFORMER TERMINALS SERVICE cont MASTER ON/OFF SWITCH Late Models FIG. 36 MASTER ON/OFF SWITCH LOCPage 120/208 VOLTS AC 120/240 VOLTS AC 3 WIRE + GND SINGLE PHASEMAIN ON/OFF SWITCH Late Models only 1006010060 Page080900 10060 SCHEMATIC WIRING DIAGRAM U3A & U38A BREWERS PRIOR TO U300004095Page 08090010060 SCHEMATIC WIRING DIAGRAM U3A - CE BREWERS S/N U300004095 - UPPage 08090010060 SCHEMATIC WIRING DIAGRAM U3833Page 08090010060 SCHEMATIC WIRING DIGRAM U3833Page 080900