Bunn Brewer ST

Use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent for cleaning all surfaces on Bunn-O-Matic equipment

Check and clean the sprayhead. The sprayhead holes must always remain open

With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. When inserted properly, no more than two inches of spring should be visible. 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 daily brewer cleaning

Remove both wires from the limit thermostat terminals

Carefully slide the limit thermostat out from under the retaining clip

Carefully slide the new limit thermostat into the retaining clip

Sign off on the Brewer Limit Thermostat Replacement

Disconnect the brewer from the power source

Rotate the dial fully counterclockwise

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

Disconnect the brewer from the power source if voltage is not as described

Disconnect the white/orange wire from terminal TL3 and the white/yellow wire from terminal TL5

Check for continuity across the two wires when the start switch is pressed to the 'START' position

Reconnect the wires if continuity is present as described

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

Disconnect the brewer from the power source

Disconnect the wires from the solenoid valve. With the 'ON/OFF' switch in the 'ON' upper position press the start switch

Check the voltage across the two wires 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 Wiring Diagrams and check brewer wiring harness

Check for continuity across the solenoid valve coil terminals

If continuity is present as described, reconnect the wires to the solenoid. If continuity is not present as described, replace the solenoid valve

Check the solenoid valve for coil action. Connect the brewer to the power source. With 'ON/OFF' switch in the 'ON' upper position press start switch and listen carefully in the vicinity of the solenoid valve for a 'clicking' sound as the coil magnet attracts

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

WHI wire connected to the terminal block and the wire from the warmer element to the 'ON/OFF' switch

Voltage across the WHI wire from the terminal block and the wire from the 'ON/OFF' switch to the warmer element

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

Continuity across the two terminals on the warmer element

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

Sign off on the Brewer Warmer Elements Test