Bunn Bunn Coffee Machine CWTF-15-1L/2U CWTF-15-1L/2U

Shut-off and disconnect the incoming water supply to the brewer

On automatic brewers gently remove the fill tube from back of fill basin

Remove the tank inlet fitting securing fill basin the tank lid. Remove fill basin and gasket. Set all three parts aside for reassembly

On brewers with faucets, disconnect the water supply to coil assembly and remove the tube from the tank to the faucet

Remove sprayhead and hex nut securing sprayhead tube to the hood. Set aside for reassembly

Disconnect the wires on the limit thermostat and the tank heater and the control thermostat (early models)

Gently pull the thermostat sensor and grommet from the tank lid

Insert a tube to the bottom of the tank and syphon ALL of the water out. (BUNN-O-MATIC has #12440 syphon assembly available for this purpose

Gently reinstall the thermostat sensor and grommet in the tank lid

Warning: This procedure requires trained personnel with PPE!

Remove the #8-32 screw securing circuit board to the mounting bracket

Remove circuit board and spacers (as required)

Remove all wires from the timer

Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 21 when reconnecting the wires

Install new circuit board with spacers (as required) to the component mounting bracket

Adjust the timer as described below

Sign off on the timer replacement

Disconnect the brewer from the power source

Remove the white or red wire from the upper terminal and the black wire from the center terminal

Check the voltage across the white wire or red wire and the black wire with a voltmeter

Disconnect the brewer from the power source

If voltage is present as described, reconnect the white or red wire

With the black wire removed, remove the wire from the lower terminal

Check for continuity across the center and lower terminal with the switch in the 'ON' position

Continuity must not be present when the switch is in the 'OFF' position

NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board

Disconnect the brewer from the power source and remove the front access panel

Remove the #8-32 screw securing circuit board to the mounting bracket

Remove circuit board and spacers (as required)

Voltage across terminals TL1 and TL2 when the 'ON/OFF' switch is in the 'ON' position

Voltage is present as described, proceed to #6

Voltage is not present as described, check the brewer wiring harness

Voltage across terminals TL1 and TL4 when the 'ON/OFF' switch is in the 'ON' position

Warning: Ensure the coffee machine is unplugged before starting the procedure

Remove the three #4-40 screws securing the warmer assembly to the brewer

Lift the warmer assembly from the brewer

Disconnect the two wires from the warmer element terminals

Remove the two #8-32 nuts securing the warmer element to the warmer plate

Securely install new warmer element

Reconnect the two wires to warmer element terminals

Securely install warmer assembly on the brewer