Bunn CDBC, CEZF service manual Brewing Circuit Problem Probable Cause

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TROUBLESHOOTING (cont.)

 

 

 

BREWING CIRCUIT

 

 

 

PROBLEM

 

PROBABLE CAUSE

 

Brew cycle will not start

1. Display flashing (CDBC-APS/TC/

 

TS/TSR) or ready light flashing

 

(CEZ-APS/TS/TSR)

 

2. No water

 

3. No power or incorrect voltage to

 

the brewer

 

4. ON/OFF switch not in the "ON"

 

position

 

5. Low water temperature (Brew

 

lockout is enabled)

 

6. Water not touching refill probe

 

inside tank

REMEDY

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

Water lines and valves to the brewer must be open.

Check for voltage across the black and white terminals at the terminal block.

The indicator lamp must be lit

Allow brewer to heat until ready lamp is lit, or disable the brew lock- out feature. (See page 7 or 8)

Press ON/OFF switch (indicator must be lit). Brewer will refill until water touches probe inside tank. Water must be in contact with refill probe before brew cycle will start.

7. Switch panel (CDBC-APS/TC/TS/

Disconnect the brewer from the

TSR)

power source. Disconnect the rib-

 

bon connector from the control

 

board. Check for continuity between

 

pins 1 & 2 (An arrow on the connec-

 

tor indicates pin 1). No continuity

 

should be present. Press the BREW

 

switch. Continuity should be present

 

for as long as the switch is held

 

"ON". If no continuity is present,

 

replace the switch membrane

 

decal.(See page 23)

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Contents Post Office BOX SPRINGFIELD, Illinois Phone 217 FAX 217Contents IntroductionUser Notices Plumbing Requirements Electrical RequirementsElectrical Hook-Up ON/OFF Switch Brew SwitchReady Indicator Operating ControlsInitial SET-UP CleaningCoffee Brewing CEZ-APS/TS/TSR Adjustments & Optional Settings Adjusting Brew VolumesCDBC-APS/TC/TS/TSR Adjustments & Optional Settings Setting Brew TemperatureDisplaying Brew Temperature Setting Brew LockoutWater Sensing Threshold Adjustment Procedure CDBC-APS/TC/TS/TSR Adjustments & Optional SettingsTroubleshooting Before troubleshooting this brewer, check for the followingTroubleshooting Refill Circuit ProblemProbable Cause RemedyTroubleshooting Refill Circuit 2a. Water Level Probe Sensing System CDBC-APS/TS/TSRWater does not heat to proper temperature Heating Circuit Problem Probable Cause RemedyWater not touching temperature probe Troubleshooting Heating Circuit Problem Probable Cause RemedyCont Control Board Cdbc & CEZReplace the control board.See Pages 21Brewing Circuit Problem Probable Cause Troubleshooting Brewing Circuit Water temperature Set-upinstructionsDripping from sprayhead Lime build up RequiredDry coffee grounds remain Sprayhead Funnel Problem Probable CauseFunnel loading Diagnostics Cause Things to CheckComponent Access ServiceContents Service Control BoardService Control Board Model CEZ-APS/TS/TSR Control BoardService Switch Panel Model CDBC-APS/TC/TS/TSR Switch PanelON/OFF Switch Wiring Service Brew Switch Start Model CEZ-APS/TS/TSR Brew Switch WiringDispense Valve Dispense ValveLimit Thermostat Limit ThermostatTank Heater Tank HeaterService Tank Heater Tank Heater WiringRefill Valve Check for continuity across the refill valve coil terminals120V AC 2 Wire 120/208V AC 3 Wire 120/240V AC 3 Wire Levelsingle PhaseSchematic Wiring Diagram CEZ-APS/TS/TSR 120V AC 2 Wire Cdbc 15, 20 & 35 APS/TC/TS

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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