Bunn S/N SNG0033000 & UP manual Troubleshooting Problem

Page 47

TROUBLESHOOTING (cont.)
Problem	Possible Cause
Water will not heat or display shows	3. Triac
HEATING TIME TOO LONG (cont.)

Troubleshooting Procedures

Remove power from the brewer. Connect a voltmeter across one of the tank heaters. Reapply power to the brewer and refer to Testing Individual Components. If the full supply voltage is measured when the tank heater is turned on, and zero voltage is measured with the triac off, then the triac is good. If half the supply voltage is measured, the triac is defective. If very low, or zero voltage is measured, there could be a defective triac or a defective control board.

Spitting or unusual steaming from sprayhead or air vent. (Water too hot)

4. Electronic Control Board	Perform the above procedure for
	testing triacs. If the voltage mea-
	sured is very low or zero, then
	substitute a control board known to
	be in good working order.
1. Triac	Remove power from the brewer.
	Connect a voltmeter across one of
	the tank heaters. Reapply power
	to the brewer and refer to Testing
	Individual Components. If the full
	supply voltage is measured when
	the tank heater is turned on, and
	zero voltage is measured with the
	triac off, then the triac is good. If
	half the supply voltage is measured,
	the triac is defective. If very low, or
	zero voltage is measured, there could
	be a defective triac or a defective
	control board.

2. Lime Buildup

CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions. Excessive mineral buildup on stainless steel surfaces can initiate corrosive reactions resulting in seri- ous leaks.

Inspect the tank assembly for ex- cessive lime deposits. Delime as required.

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Contents Phone 217 529-6601 FAX 217 Single TF DBCBUNN-O-MATIC Commercial Product Warranty Table of Contents User Notices 37881.0002 Volt ac single phase Hz modelsElectrical HOOK-UP 230 volt ac Single phase, 60 Hz models Electrical Requirements Models without power cordPlumbing HOOK-UP CE RequirementsPlumbing Requirements Brew Switch Main ON/OFF SwitchBatch Selector Switches ON/OFF Switch Enable BrewCoffee Brewing Initial SetupCleaning Glossary Programming Programming SwitchesProgramming Switch DRIP-OUT Times Program Functions LevelRecipes Returns to a LevelContinues to D Continues to Program Flow DiagramReturn to a Programming the Brewer Procedure for modifying units of measure Units Setting Units of MeasureThis function allows the operator to set Brew Procedure for Setting the RecipeSET NEW Recipe Refer to SET Pulse Brew for description SET NEW RecipesSizes DONE? Card Contains Recipe for Procedure to program the coffee nameReview RECIPES? Noyes To exit, press Next until the display reads That Review RECIPES/MODIFY RECIPES/SET UP no Name Coffee NamesProcedure for reviewing recipes NextScreen Brew OZ Setting or Adjusting Brew VOL- UmesReview Recipes BypassModifying pulse brew Range 1st on time off to 4 minutes SET Pulse BrewSET Pulse Brew NO-NAME ModifyshownextSET Pulse Brew Easy Pulse Setup DONE? SET Pulse Brew Enter TimesTIMES? Batches DONE? SET PreinfusionSetup Complete Assign Recipe ? Enable ADS?Assign Recipes Screen Spray OZ/M SET TempSET Ready Calibrate Spray .. Press Brew to Start Bypass OZ/MCalibrate Flow Start Procedures to calibrate the bypass flow rateCalibrate Flow Funnel Detect optional Procedure to set funnel detectProcedures to view/reset the brew counters Brew CountersBrew Valve Service ToolsTesting individual components outputs Procedure to test components outputsFrequency Nothing PressedProcedure to set factory defaults Factory DefaultsPossible Cause TroubleshootingTroubleshooting Procedures Screen DisplayedPress ON/OFF to terminate the cycle TemperatureTriac Failure ON/OFF switch was pressed after the brew cycle was startedPress ON/OFF to terminate the brew cycle Tank Heater failureBroken or not making connection Temperature Sensor ProbeWires shorted to housing, or to Water shut off to brewerData plate within +/- 10% Equipment will not operate No power or incorrect voltageBrew switch Switch test procedures Brew Valve Switch test proceduresSee above or boiling Troubleshooting Problem Possible CauseOverflow Protection Switch When this condition occurs, With power removed from brewer Holding it in open stateHeating Time TOO Long Limit ThermostatTroubleshooting Problem 90 psi 138 and 620 kPa Inconsistent beverage level StrainerServer Pointing towards the brewer Improper water pressureFor each brew cycle Consistently high or low beverage Brew Volume adjustmentWater temperature Level in serverPlumbing lines Water Supply Tank Heaters Troubleshooting Problem Possible Cause Weak beverageRemove and clean lime off tank heaters Brewer is making unusual noisesSchematic Wiring Diagram Single TF DBC Schematic Wiring Diagram Wire Single Phase Schematic Wiring Diagram Single TF DBC