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Bunn ICB/TWIN manual TROUBLESHOOTING cont, BREWING CIRCUIT cont, Problem, Probable Cause, Remedy

Models: ITB/ITCB ICB/TWIN

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TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM		PROBABLE CAUSE		REMEDY
Dripping from sprayhead		1. Lime build up		Inspect the tank assembly for ex-
				cessive lime deposits. Delime as
				required.
		2. Dispense valve		Check/replace
Weak beverage		1. Sprayhead		A clean sprayhead must be used for
				proper extraction.
		2. Water temperature		Place an empty brew funnel on an
				empty decanter beneath the spray-
				head. Initiate brew cycle and check
				the water temperature immediately
				below the sprayhead with a ther-
				mometer. The reading must not be
				less than 195°F (91°C). Adjust the
				temperature setting to increase the
				water temperature. Refer to Initial
				Set-up instructions.
				BUNN® paper ﬁlters must be used
		3. Filter type		for proper extraction.
				A ﬁne drip or grind must be used
		4. Coffee grind		for proper extraction.
				The BUNN® paper ﬁlter must be
		5. Funnel loading		centered in the funnel and the bed
				of grounds leveled by shaking
				gently.
Dry coffee grounds remain in the		1. Sprayhead		Make sure sprayhead is present and
funnel				holes are clear and unobstructed.
				The BUNN® paper ﬁlter must be
		2. Funnel loading		centered in the funnel and the bed
				of grounds leveled by shaking
				gently.
Low beverage serving tempera-		1. Thermal server/airpot not pre-		Preheat server
ture		heated before brew cycle

8	42461 0911809

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Bunn ICB/TWIN, ITB/ITCB manual TROUBLESHOOTING cont, BREWING CIRCUIT cont, Problem, Probable Cause, Remedy

Contents

SERVICE & REPAIR MANUAL ITB/ITCB ICB/TWINInfusion Series BUNN-O-MATIC CORPORATIONBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY CONTENTS INTRODUCTIONTROUBLESHOOTING Exercise extreme caution when servicing electrical equipmentFollow recommended service procedures Replace all protective shields or safety noticesTROUBLESHOOTING cont REFILL CIRCUIT PROBLEM PROBABLE CAUSEREMEDY Remove Level Probe and checkTROUBLESHOOTING cont HEATING CIRCUIT PROBLEMLime build up on temperature Inspect probe and tank assemblyTROUBLESHOOTING cont BREWING CIRCUIT PROBLEMdisable the brew lockout feature NOTE Volume adjustments must beTROUBLESHOOTING cont BREWING CIRCUIT contPROBLEM PROBABLE CAUSEDIAGNOSTICS MESSAGEPROBABLE CAUSE REMEDYCOMPONENT ACCESS FIG. 10-1 ICB COMPONENT ACCESSFIG. 10-2 ITB/ITCB COMPONENT ACCESS FIG. 10-3 ICB TWIN COMPONENT ACCESSTest Procedures Check for Power to boardRemoval and Replacement Faceplate Removal and ReplacementMEMBRANE SWITCH FIG. 12-1 MEMBRANE SWITCH LocationFIG. 12-2 MEMBRANE SWITCH CONTINUITY Test ProceduresBREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBs FIG. 13-1 EARLY BREW VALVE LocationIf no sound is heard as described, proceed to #4 FIG. 13-2 EXPLODED VIEWBREW VALVE LATE MODELS FIG. 14-1 LATE MODEL BREW VALVE Location FIG. 14-2 LATE MODEL BREW VALVETest Procedures Removal and ReplacementDisassembly REFILL VALVES FIG. 15-1 REFILL VALVES LocationIf voltage is present, proceed to # If the sound is not heard as described, pro- ceed to #REFILL VALVES EARLY ICBEARLY ITCB CURRENT ICB & & ITBTANK HEATERS FIG. 17-1 ICB TWIN TANK HEATERS LocationFIG. 17-2 DV TANK HEATERS Test ProceduresLIMIT THERMOSTAT FIG. 18-1 LIMIT THERMOSTATLocation The limit thermostat is located on the tank lid on theTEMPERATURE PROBE FIG. 19-1 TEMPERATURE PROBE Location FIG. 19-2 TEMPERATURE PROBE FIG. 19-3 TESTING TEMPERATURE PROBERemoval and Replacement CONTINUED Test ProceduresTEMPERATURE PROBE Removal and Replacement CalibrationFIG. 20-1 CALIBRATE TEMP PROBE FIG. 20-2 CALIBRATIONVOLTAGE SELECTOR SWITCH FIG. 21-1 VOLTAGE SELECTOR SWITCH Location Test ProcedureFIG. 21-2 VOLTAGE SELECTOR SWITCH TERMINALS Removal and ReplacementPOWER SWITCH FIG. 22-1 POWER SWITCH ICB SHOWN Location FIG. 22-2 ROCKER SWITCHTest Procedure Removal and ReplacementSCHEMATIC WIRING DIAGRAM iTCBA, iTCBB 200V AC 2 WIRE230V AC 2 WIRE SINGLE PHASESCHEMATIC WIRING DIAGRAM ITCB-DV & ITCB-C-DV120V AC 2 WIRE 120/208V AC 3 WIREWITH FACTORY SWEETENER SCHEMATIC WIRING DIAGRAM120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE ITCB-DV & ITCB-C-DVSCHEMATIC WIRING DIAGRAM ICB-DV 120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASESCHEMATIC WIRING DIAGRAM ICB TWIN 3 WIRE + GNDSINGLE PHASE 120/208 OR 120/240SCHEMATIC WIRING DIAGRAM iCBA, iCBB 200V AC 2 WIRE 230V AC 2 WIRE SINGLE PHASE230 VOLTS AC SCHEMATIC WIRING DIAGRAM ICB TWIN 230V Chassis Ground TERM2 WIRE + GND SINGLE PHASE SINGLE & DUAL DILUTION MODELS AND MODELS w/OPTIONAL SWEETENER SCHEMATIC WIRING DIAGRAM ITB120V AC 2 WIRE + GROUND SINGLE PHASE