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

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

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

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

Warning: Disconnect the brewer from the power source before starting the procedure

Disconnect the polarized, three pin connector from the brewer wiring harness and rotate the brew timer dial fully counterclockwise

Check the voltage across sockets P2 & P3 (white and black wires) of the female connector

Is the voltage 120 volts ac for two wire 120 volt models and three wire 120/240 volt models or 200 to 230 volts ac on two wire 200 volt or 230 volt models?

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

Check the voltage across the sockets P1 & P2 (blue and white wires) of the female connector when the 'ON/OFF' switch is in the 'ON' position (upper) and start switch pressed

Is the voltage 120 volts ac for two wire 120 volt models and three wire 120/240 volt models or 200 to 230 volts ac for two wire 200 volt or 230 volt models?

If voltage is not present as described, check the brewer wiring harness

Reconnect the three pin connector from main wiring harness to the timer

Remove wires from control thermostat leads

Remove the thermostat capillary bulb by firmly pulling-up on the capillary at the tank lid

Remove the one #8-32 screw securing the control thermostat to the component bracket in the trunk

Slide the grommet to the line 4.5\ above the bulb on the new capillary tube"

Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid

Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position

NOTE - The capillary tube must be clear of any electrical termination and not kinked

Select the model of the coffee machine

Secure the control thermostat inside the hood (for Early Models)