Bunn Bunn Coffee Machine CWTF 0/6 TWIN CWTF 0/6 TWIN

Disconnect the water supply tube from the fill basin

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

On brewers with faucet shut-off water supply to the brewer and disconnect the inlet and outlet water lines to the faucet coil assembly

Disconnect the black wire on the limit thermostat from the tank heater switch. On late model brewers also disconnect the blue wire from the limit thermostat to the control thermostat

Disconnect the black wire and the white or red wire from the tank heater terminals

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

Remove the eight #8-32 nuts securing the tank lid to the tank

Remove the tank lid with limit thermostat, sprayhead tube, tank heater, coil assembly and control thermostat w/bracket (early models only)

Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets and discard

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

Disconnect the brewer from the power source

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

Disconnect the brewer from the power source

Use the white or red wire to the terminal block and the white/red, brown/black or violet wire to the 'ON/OFF' switch

Check voltage across the white or red and white/ red, brown/black or violet with a voltmeter with the 'ON/OFF' switch in the 'ON' position

Disconnect the brewer from the power source

If voltage is present as described, proceed to #5. If voltage is not present as described, check brewer wiring harness

Check the continuity across the two terminals on the warmer element

If continuity is present as described, reconnect the white or red and white/red, and brown/black or violet wires on the warmer element

If continuity is not present as described, replace the warmer element

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

All wires removed from limit thermostat terminals

Limit thermostat slid out from under the retaining clip and removed

New limit thermostat slid into the retaining clip

Wires reconnected to the new limit thermostat

Sign off on the thermostat replacement

Disconnect the brewer from the power source

Locate the blue wire on the control thermostat

Check the voltage across the blue wire on the control thermostat and the white insert on two pole 120 volt terminal block or three pole 120/ 240 volt terminal blocks and the red insert on two wire 200 volt or 240 volt terminal block with a voltmeter

Connect the brewer to the power source

Disconnect the brewer from the power source

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness

Locate the black wire on the control thermostat