Bunn U3A Troubleshooting, Problem Probable Cause, Brew cycle will not start No water, Brewer

Page 8

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 terminal block for

120 volts ac across the red and white terminals and the black and white terminal on three wire 102/208 volt or 120/240 volt models.

(A2) Check the terminal block for 208 volts ac, 230 volts ac or 240 volts ac on "A Series" brewers across the red and black terminals on two wire single phase 208 volt, 230 volt and 240 volt models.

(A3) Check the terminal block for 208 volts ac, 240 volts ac, 380 volts ac across the black and blue terminals, the blue and red and the black and red terminals on three wire three phase 208 volt, 240 volt and 380 volt models.

Page 8

10060

031500

 

Image 8
Contents U3A Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction User NoticesElectrical Installation Instructions Electrical RequirementsPlumbing Requirements Initial SetupCE Requirements Initial Setup Adjusting Brew VolumesFilter Holder CleaningCoffee Brewing Troubleshooting Problem Probable CauseBrew cycle will not start No water BrewerTroubleshooting Problem RemedyRefer to Service Circuit Breaker for testing procedures. See Use Bunn filters made for the U3 brewer Remove obstructionRemove and clean lime off the tank heater. See Contents ServiceComponent Access Location ServiceWire Models and 440V Four Wire Models Contactor ContactorService Contactor Control Thermostat Fuse and Fuse Hilder Limit Thermostat Limit thermostatReconnect the blue wire to T1 on the liquid level board Liquid Level Board and Level ProbeModel Voltage Jumper Not TouchingLiquid Level Board Terminals BLK from Main Harness RED to Main Harness ON/OFF SwitchTest Procedures Disconnect the brewer from the power source Pump Assembly Pump AssemblyRelay Brewers W/BREW Lockout If voltage is present as described, proceed to #3Removal and Replacement Disconnect the wires from the relay Refer to and reconnect the wires BLU from Start SwitchBrew Timer BLU to Start Switch BLU from Brew TimerSelector Switch Half Batch Option Selector Switch Half BATCHP1317.30Solenoid SolenoidEarly Models Start Switch Brew Start Switch BrewTank Heaters Tank HeaterTimer Early Models Thermal Fuses 230V-CE Models onlyService Timer Early Modelscont Disconnect the black and white wires to the pumpIf voltage is present as described, proceed to #8 Harness BLK to Pump Lead WHI to Pump LeadIf voltage is as described, proceed to #7 Service Digital Timer Late ModelsAdjust the timer as described below Timer Setting Digital Timer Terminals Transformer Remove the transformer and discardService Master ON/OFF Switch Late Models Master ON/OFF Switch LOC120/208 Volts AC 120/240 Volts AC 3 Wire + GND Single Phase 10060 080900 10060 080900 Schematic Wiring Diagram U3A CE Schematic Wiring Diagram U3833 Schematic Wiring Digram U3833

U3A, U3 specifications

Bunn U3A, also known as Bunn's U3A, is a unique and innovative approach to education that caters specifically to retirees and senior citizens. The primary aim of this initiative is to foster lifelong learning and social engagement among older adults, empowering them to explore various subjects of interest and connect with like-minded individuals.

One of the main features of Bunn U3A is its diverse range of courses and activities. From art and music appreciation to digital literacy and gardening, participants can choose from a variety of subjects that pique their interest. This broad curriculum is designed to cater to varied backgrounds and skill levels, ensuring that everyone finds something that resonates with them. The courses are typically led by volunteer tutors, many of whom are retired professionals passionate about sharing their knowledge and experiences.

Another characteristic of Bunn U3A is its strong emphasis on community and socialization. By providing a supportive and welcoming environment, members are encouraged to interact, collaborate, and form friendships. The organization often hosts events, workshops, and excursions, further enhancing the sense of belonging and camaraderie among participants. This communal aspect is crucial for combating feelings of isolation that can sometimes accompany retirement.

Bunn U3A leverages technology to enhance the learning experience. Many courses integrate digital tools and online platforms, enabling participants to access resources and engage in discussions beyond the classroom. This tech-savvy approach ensures that members are equipped with essential skills that are increasingly relevant in today’s digital world. As a result, participants often find themselves not only enriching their knowledge but also enhancing their technological proficiency.

In addition to its educational offerings and community focus, Bunn U3A promotes a culture of inclusivity. Everyone, regardless of previous academic background, is welcomed to join, emphasizing that learning is a lifelong journey. The philosophy that underpins Bunn U3A is one of empowerment, with a commitment to ensuring that older adults continue to thrive intellectually, socially, and emotionally.

In summary, Bunn U3A stands out as a vibrant learning community that prioritizes the educational and social needs of retirees. With its diverse courses, strong community bonds, and integration of technology, it serves as a model for how organizations can successfully promote lifelong learning and engagement among older individuals, enriching their lives in meaningful ways.