Bunn ICB/TWIN, ITB/ITCB manual Heating Circuit Problem Probable Cause Remedy

Page 6

TROUBLESHOOTING (cont.)

HEATING CIRCUIT

PROBLEM

 

PROBABLE CAUSE

 

REMEDY

Water does not heat to proper

1.

Display's error message

 

Brewer has shut down due to mal-

temperature

 

 

 

function. See Diagnostics.

IMPORTANT: Make sure no tem-

 

 

 

 

perature tests are taken before

2. Water not touching main (short)

 

Remove level probe and grommet.

the display reads ready. Tank tem-

level probe

 

Look into hole on tank lid. Water

perature must be stabilized before

 

 

 

must be within approximately one

readings are taken.

 

 

 

inch from top of tank.

 

 

3. Water Level Probe Sensing

 

Check refill circuit. Heaters will not

 

 

System

 

turn on if water is not grounding

 

 

 

 

 

level probe.

 

 

4.

Temperature Probe

 

Check/replace

 

 

5.

Limit Thermostat or TCO

 

Check/replace

 

 

6.

Tank Heater

 

Check/replace

Spitting or excessive steaming

1.

Lime build up on temperature

 

Inspect probe and tank assembly

(cont.)

probe, tank or tank heater

 

for excessive lime deposits. Delime

 

 

 

 

 

as required.

 

 

2.

Temperature Probe

 

Check/replace

 

 

3.

Control Board

 

Check/replace

Brewer is making unusual noises

1.

Plumbing lines

 

Plumbing lines should not rest on

 

 

 

 

 

the counter top.

 

 

2.

Water supply

 

The brewer must be connected to

 

 

 

 

 

a cold water supply.

 

 

3.

Lime build up

 

Remove the tank lid and clean in-

 

 

 

 

 

side of tank with a deliming agent,

 

 

 

 

 

if necessary.

6

42461 0911809

 

Image 6
Contents ITB/ITCB ICB/TWIN BUNN-O-MATIC Commercial Product Warranty Introduction Troubleshooting Control BoardsProbable Cause TroubleshootingRefill Circuit Problem RemedyHeating Circuit Problem Probable Cause Remedy Brewing Circuit Problem Probable Cause Remedy Troubleshooting Brewing Circuit Problem Probable Cause RemedyDiagnostics Message Probable Cause RemedyComponent Access ICB Component AccessControl Board Membrane Switch Membrane Switch ContinuityEarly Brew Valve Exploded ViewBrew Valve Late Models Late Model Brew ValveDisassembly Refill ValvesRefill Valves Early ICB Early ItcbTank Heaters ICB Twin Tank HeatersLimit Thermostat Limit ThermostatsTemperature Probe Testing Temperature ProbeCalibration Calibrate Temp ProbeVoltage Selector Switch Test ProcedurePower Switch Test Procedure Removal and ReplacementSchematic 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