Bunn S/N SNG0033000 & UP manual Troubleshooting, Screen Displayed, Possible Cause

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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 personnel.

•All electronic components have 120 - 240 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 per- manent. 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 sole- noids 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 avoid twists and kinks in the tubing.

•Make certain that all plumbing connections are sealed and electrical connections tight and iso- lated.

•This brewer is heated at all times. Keep away from combustibles.

WARNING

•Exercise extreme caution when servicing electrical equipment.

•Disconnect the brewer from the power source when servicing, except when electrical tests are specified.

•Follow recommended service procedures.

•Replace all protective shields or safety notices.

Screen Displayed

OVERFLOW CUP FULL. EMPTY CUP

Possible Cause

1.1. Overflow cup is full of water. This could be caused by boiling; see chart on page 32. Also could be Refill Sensitivity adjustment; see page 33.

Troubleshooting Procedures

Empty cup. Correct cause and retry.

NO FUNNEL

PRESENT

1.SMART FUNNEL not fully inserted into the funnel rails.

2.Not using a SMART FUNNEL, and the FUNNEL DETECT function is activated (on).

Position the funnel so that the sensor is directly beneath the sensor coil on the brewer.

Disable the FUNNEL DETECT func- tion.

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Contents Single TF DBC Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Table of Contents User Notices Electrical HOOK-UP Volt ac single phase Hz models37881.0002 Electrical Requirements Models without power cord 230 volt ac Single phase, 60 Hz modelsPlumbing Requirements CE RequirementsPlumbing HOOK-UP Main ON/OFF Switch Batch Selector SwitchesON/OFF Switch Enable Brew Brew SwitchInitial Setup Coffee BrewingCleaning Glossary Programming Switches ProgrammingProgramming Switch Recipes Program Functions LevelDRIP-OUT Times Continues to D LevelReturns to a Return to a Program Flow DiagramContinues to Programming the Brewer Units Setting Units of Measure Procedure for modifying units of measureSET NEW Recipe Procedure for Setting the RecipeThis function allows the operator to set Brew Sizes DONE? SET NEW RecipesRefer to SET Pulse Brew for description Procedure to program the coffee name Card Contains Recipe forReview RECIPES? Noyes Review RECIPES/MODIFY RECIPES/SET UP no Name Coffee Names Procedure for reviewing recipesNext To exit, press Next until the display reads ThatBrew OZ Setting or Adjusting Brew VOL- Umes ScreenBypass Review RecipesSET Pulse Brew Modifying pulse brew Range 1st on time off to 4 minutesNO-NAME Modifyshownext SET Pulse BrewSET Pulse Brew Easy Pulse Setup TIMES? SET Pulse Brew Enter TimesDONE? SET Preinfusion Batches DONE?Setup Complete Assign Recipes Enable ADS?Assign Recipe ? SET Ready SET TempScreen Spray OZ/M Calibrate Flow Bypass OZ/MCalibrate Spray .. Press Brew to Start Calibrate Flow Procedures to calibrate the bypass flow rateStart Procedure to set funnel detect Procedures to view/reset the brew countersBrew Counters Funnel Detect optionalService Tools Testing individual components outputsProcedure to test components outputs Brew ValveNothing Pressed FrequencyFactory Defaults Procedure to set factory defaultsTroubleshooting Troubleshooting ProceduresScreen Displayed Possible CauseTemperature Press ON/OFF to terminate the cycleON/OFF switch was pressed after the brew cycle was started Press ON/OFF to terminate the brew cycleTank Heater failure Triac FailureTemperature Sensor Probe Wires shorted to housing, or toWater shut off to brewer Broken or not making connectionEquipment will not operate No power or incorrect voltage Brew switch Switch test proceduresBrew Valve Switch test procedures Data plate within +/- 10%Troubleshooting Problem Possible Cause Overflow Protection Switch When this condition occurs,With power removed from brewer Holding it in open state See above or boilingLimit Thermostat Heating Time TOO LongTroubleshooting Problem Inconsistent beverage level Strainer Server Pointing towards the brewerImproper water pressure 90 psi 138 and 620 kPaConsistently high or low beverage Brew Volume adjustment Water temperatureLevel in server For each brew cycleTroubleshooting Problem Possible Cause Weak beverage Remove and clean lime off tank heatersBrewer is making unusual noises Plumbing lines Water Supply Tank HeatersSchematic Wiring Diagram Single TF DBC Schematic Wiring Diagram Wire Single Phase Schematic Wiring Diagram Single TF DBC