Bunn U3A service manual Troubleshooting

Page 9

TROUBLESHOOTING (cont.)

PROBLEM

PROBABLE CAUSE

REMEDY

Brew cycle will not start (cont)

2.No power or incorrect voltage to the brewer (cont)

(A4) Check the terminal block for

440 volts ac across the black and blue terminals, black and red termi- nals and the red and blue terminals on four wire three phase 440 volt models.

(B)Check circuit breakers or fuses.

3.Water level below pump housing. (Water level in the hot water gauge glass should be approximately half full).

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

Brew cycle starts with brew lockout relay engaged.

4.

ON/OFF Switch

Refer to Service - ON/OFF Switch for

 

 

testing. See page 22

5.

Start Switch

Refer to Service - Start Switches for

 

 

testing procedures. See page 29

6.

Relay

Refer to Service - Relay for testing

 

 

procedures. See page 24

7.

Timer

Refer to Service - Timer for testing

 

 

procedures. See page 31 or 33

8.

Pump

Refer to Service - Pump for testing

 

 

procedures. See page 23

9.

Solenoid Valve

Refer to Service - Solenoid Valve for

 

 

testing procedures. See page 27

10. Strainer

(A) Direction of flow arrow must be

 

 

pointing towards brewer.

 

 

(B) Remove the strainer and check

 

 

for obstructions. Clear or replace.

1.

Relay

Refer to Service - Relay for testing

 

 

procedures. See page 24

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Contents Phone 217 529-6601 FAX 217 U3ABUNN-O-MATIC Commercial Product Warranty User Notices IntroductionElectrical Requirements Electrical Installation InstructionsInitial Setup CE RequirementsPlumbing Requirements Adjusting Brew Volumes Initial SetupCleaning Coffee BrewingFilter Holder Problem Probable Cause TroubleshootingBrew cycle will not start No water BrewerTroubleshooting Remedy ProblemUse Bunn filters made for the U3 brewer Remove obstruction Refer to Service Circuit Breaker for testing procedures. SeeRemove and clean lime off the tank heater. See Service Component AccessContents Service Wire Models and 440V Four Wire ModelsLocation Contactor ContactorService Contactor Control Thermostat Fuse and Fuse Hilder Limit thermostat Limit ThermostatLiquid Level Board and Level Probe Reconnect the blue wire to T1 on the liquid level boardModel Voltage Jumper Not TouchingLiquid Level Board Terminals ON/OFF Switch Test Procedures Disconnect the brewer from the power sourceBLK from Main Harness RED to Main Harness Pump Assembly Pump AssemblyIf voltage is present as described, proceed to #3 Relay Brewers W/BREW LockoutRefer to and reconnect the wires BLU from Start Switch Removal and Replacement Disconnect the wires from the relayBrew Timer BLU to Start Switch BLU from Brew TimerSelector Switch Half BATCHP1317.30 Selector Switch Half Batch OptionSolenoid SolenoidEarly Models Start Switch Brew Start Switch BrewTank Heater Tank HeatersThermal Fuses 230V-CE Models only Timer Early ModelsDisconnect the black and white wires to the pump Service Timer Early ModelscontIf voltage is present as described, proceed to #8 Harness BLK to Pump Lead WHI to Pump LeadService Digital Timer Late Models Adjust the timer as described below Timer SettingIf voltage is as described, proceed to #7 Digital Timer Terminals Remove the transformer and discard TransformerMaster ON/OFF Switch LOC Service Master ON/OFF Switch Late Models120/208 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.

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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.