Bunn CEZF, CDBC service manual Troubleshooting, Refill Circuit Problem, Probable Cause, Remedy

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TROUBLESHOOTING (cont.)

REFILL CIRCUIT

PROBLEM

Will not fill or refill

Fill or refill does not shut "OFF" (ON/OFF Switch "ON")

PROBABLE CAUSE

1.Power off to brewer (CDBC-APS/ TC/TS/TSR & CEZ-APS/TS/TSR)

2.Water shut off (CDBC-APS/TC/ TS/TSR & CEZ-APS/TS/TSR)

3.Display flashing (CDBC-APS/TC/ TS/TSR) or ready light flashing (CEZ-APS/TS/TSR)

4.ON/OFF Switch (CDBC-APS/TC/ TS/TSR & CEZ-APS/TS/TSR)

5.Lime build up on Probe (CDBC- APS/TC/TS/TSR & CEZ-APS/TS/ TSR)

6.Refill Valve or Control Board (CDBC-APS/TC/TS/TSR & CEZ- APS/TS/TSR)

7.Water is too conductive for proper operation when using the factory setting of sensing threshold. (CDBC- APS/TC/TS/TSR)

1.Lime build up on probe (CDBC- APS/TC/TS/TSR & CEZ-APS/TS/ TSR)

REMEDY

Press ON/OFF switch on control panel to determine if power is ON.

Make sure water is ON.

Brewer has shut down due to malfunction (See Diagnostic Chart in manual, Page 19, or under top lid of brewer).

Make sure ON/OFF Switch is "ON" and indicator is lit.

Remove the Probe and check for lime deposit on tip. Clean and reinstall.

Disconnect the brewer from the power source and remove wires from refill valve coil. Check for con- tinuity across the terminals of the solenoid coil. If continuity is not present, replace the refill valve (See page 30). If continuity is present, the valve may be stuck closed. Shut water off to brewer. Set the ON/OFF switch to the "OFF" position. Open the faucet and drain water down in the tank until flow stops or slows to a trickle. Attach a voltmeter to the terminals of the refill solenoid. Con- nect the brewer to the power source. Press the switch "ON". Within five seconds, voltage should be present at the solenoid terminals. If voltage is not present, refer to the wiring diagrams and check the wiring har- ness.

Reset the Water Sensing Thresh- old Adjustment Procedures on page 9.

Remove Probe and check for lime deposits on tip. Clean and reinstall.

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Contents Phone 217 FAX 217 Post Office BOX SPRINGFIELD, IllinoisIntroduction ContentsUser Notices Electrical Hook-Up Electrical RequirementsPlumbing Requirements Operating Controls ON/OFF SwitchBrew Switch Ready IndicatorCoffee Brewing CleaningInitial SET-UP Adjusting Brew Volumes CEZ-APS/TS/TSR Adjustments & Optional SettingsSetting Brew Lockout CDBC-APS/TC/TS/TSR Adjustments & Optional SettingsSetting Brew Temperature Displaying Brew TemperatureCDBC-APS/TC/TS/TSR Adjustments & Optional Settings Water Sensing Threshold Adjustment ProcedureBefore troubleshooting this brewer, check for the following TroubleshootingRemedy TroubleshootingRefill Circuit Problem Probable Cause2a. Water Level Probe Sensing System CDBC-APS/TS/TSR Troubleshooting Refill CircuitWater not touching temperature probe Heating Circuit Problem Probable Cause RemedyWater does not heat to proper temperature Problem Probable Cause Remedy Troubleshooting Heating CircuitPages 21 ContControl Board Cdbc & CEZ Replace the control board.SeeBrewing Circuit Problem Probable Cause Troubleshooting Brewing Circuit Required Water temperatureSet-upinstructions Dripping from sprayhead Lime build upFunnel loading Problem Probable CauseDry coffee grounds remain Sprayhead Funnel Cause Things to Check DiagnosticsContents ServiceComponent Access Control Board ServiceControl Board Service Control Board Model CEZ-APS/TS/TSRSwitch Panel Service Switch Panel Model CDBC-APS/TC/TS/TSRON/OFF Switch Wiring Brew Switch Wiring Service Brew Switch Start Model CEZ-APS/TS/TSRDispense Valve Dispense ValveLimit Thermostat Limit ThermostatTank Heater Tank HeaterTank Heater Wiring Service Tank HeaterCheck for continuity across the refill valve coil terminals Refill ValveLevelsingle Phase 120V AC 2 Wire 120/208V AC 3 Wire 120/240V AC 3 WireSchematic Wiring Diagram CEZ-APS/TS/TSR Cdbc 15, 20 & 35 APS/TC/TS 120V AC 2 Wire

CEZF, CDBC specifications

The Bunn CEZF and CDBC are two popular commercial coffee brewers offered by Bunn, a leader in the coffee equipment industry. Both models are designed to meet the demands of high-traffic settings such as cafes, restaurants, and other foodservice establishments. They combine advanced technology with user-friendly features to ensure consistent, high-quality coffee with minimal effort.

The Bunn CEZF model is known for its easy-to-use design and efficiency. One of its standout features is the "Digital Brewer" control, which allows operators to adjust brewing parameters such as brew time and water temperature. This level of customization enables baristas to consistently create the perfect cup of coffee tailored to their specific blends. Furthermore, the CEZF has a unique "intelligent" warming plate that maintains the optimal serving temperature without over-extraction, ensuring that each cup of coffee remains flavorful.

On the other hand, the Bunn CDBC incorporates a dual brewing capacity that allows for larger batches of coffee to be made simultaneously. This feature is particularly beneficial in high-demand environments where quick service is essential. The CDBC also utilizes a patented brew control technology, enabling users to select their brew strength with just a few button presses. This flexibility is complemented by its high-performance heating element, which heats water rapidly, ensuring that coffee is brewed at the ideal temperature for optimal extraction.

Both models are equipped with a large water reservoir, ensuring a continuous supply of hot water for brewing. They also feature high-quality stainless steel constructions that enhance durability and make cleaning easier. The intuitive interface on both models simplifies operation, with clear instructions that allow even novice users to brew exceptional coffee right away.

In terms of safety, both the CEZF and CDBC are designed with auto shut-off features and integrated safety protocols, minimizing the risk of overheating and ensuring a secure brewing environment.

Overall, the Bunn CEZF and CDBC are excellent choices for any commercial kitchen or café looking to serve high-quality coffee efficiently. Their advanced features, durability, and ease of use make them top contenders in the commercial brewing category.
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