Bunn ITB/ITCB, ICB/TWIN manual Testing Temperature Probe

Page 19

TEMPERATURE PROBE

FIG. 19-1 TEMPERATURE PROBE

Location:

The temperature probe is inserted through the tank lid assembly.

Test Procedures:

1.Disconnect the brewer from the power source.

2.With a DC voltmeter, check voltage across the two wires at J13 (J3 on ITB) on control board (black probe to black wire, red probe to white wire refer to FIG 19-2). Connect the brewer to the power source. The indication should be between 4vdc (cool) to 1vdc at ready temperature.

3.Disconnect the brewer from the power source.

If voltage is present as described, circuit is working correctly.

If voltage is not present as described, proceed to #4.

4.Disconnect temperature probe from J9 on control board. Check the resistance across the two ter- minals of the temperature probe. The indication should be between 10.5K cool to 870 at ready temperature.

If resistance is to specification, replace the control board.

If resistance is not to specification, replace the tem- perature probe.

FIG. 19-2 TEMPERATURE PROBE

FIG. 19-3 TESTING TEMPERATURE PROBE

Removal and Replacement:

CONTINUED

19

42461 0911809

 

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Contents ITB/ITCB ICB/TWIN BUNN-O-MATIC Commercial Product Warranty Introduction Control Boards TroubleshootingRemedy TroubleshootingRefill Circuit Problem Probable CauseHeating Circuit Problem Probable Cause Remedy Brewing Circuit Problem Probable Cause Remedy Problem Probable Cause Remedy Troubleshooting Brewing CircuitMessage Probable Cause Remedy DiagnosticsICB Component Access Component AccessControl Board Membrane Switch Continuity Membrane SwitchExploded View Early Brew ValveLate Model Brew Valve Brew Valve Late ModelsRefill Valves DisassemblyEarly Itcb Refill Valves Early ICBICB Twin Tank Heaters Tank HeatersLimit Thermostats Limit ThermostatTesting Temperature Probe Temperature ProbeCalibrate Temp Probe CalibrationTest Procedure Voltage Selector SwitchTest Procedure Removal and Replacement Power SwitchSchematic Wiring Diagram iTCBA, iTCBB Schematic Wiring Diagram With Factory Sweetener Schematic Wiring Diagram ICB-DV Schematic Wiring Diagram ICB Twin Schematic Wiring Diagram iCBA, iCBB Schematic Wiring Diagram ICB Twin 230V Chassis Ground Term Schematic Wiring Diagram ITB
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