Bunn Coffee Machine CWTF-APS DV

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

Locate the blue wire on the control thermostat

Voltage across the blue wire on the control thermostat

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

Locate the black wire on the control thermostat

Remove the capillary bulb and grommet from the tank

Voltage across the black wire of the control thermostat when the control thermostat is turned fully clockwise

If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5\ (6.0\" for Single CW models) above the bulb

Sign off on the thermostat test

Warning: Always unplug the machine before cleaning

Clean all surfaces with a damp cloth rinsed in mild, non-abrasive, liquid detergent

Check and clean the sprayhead. Ensure the sprayhead holes are open

With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. Saw back and forth five or six times

Note: In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes less than a minute

Sign off on the coffee machine cleaning

Warning: Disconnect the brewer from the power supply before starting the test

Disconnect the pink and tan wires from the switch terminals

Check for continuity across the two terminals on the switch when it is in the both positions

Continuity must be present across these terminals only in the full position

If continuity is not present as described, replace the switch

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

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 re-quired) to the component mounting bracket

Adjust the timer as described below

Sign off on the timer replacement

Remove all wires from limit thermostat terminals

Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat

Carefully slide the new limit thermostat into the retaining clip

Sign off on the thermostat replacement