Bunn TB3 User Guide

Page 9

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems 

encountered.  If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic 
Technical Service Department.

• 

Inspection, testing, and repair of electrical equipment should be performed only by qualifi ed service person-
nel.

•  All electronic components have 120 - 240 volt ac and low voltage dc potential on their terminals.  Shorting 

of terminals or the application of external voltages may result in board failure.

•  Intermittent operation of electronic circuit boards is unlikely.  Board failure will normally be permanent.  If 

an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a 
terminal or crimp.

•  Solenoid removal requires interrupting the water supply to the valve.  Damage may result if solenoids are 

energized for more than ten minutes without a supply of water.

•  The use of two wrenches is recommended whenever plumbing fi ttings are tightened or loosened.  This will 

help to avoid twists and kinks in the tubing.

•  Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
•  This brewer is heated at all times.  Keep away from combustibles.

WARNING – 
 

•  Exercise extreme caution when servicing electrical equipment.

 

•  Unplug the brewer when servicing, except when electrical tests are specifi ed.

 

•  Follow recommended service procedures

 

•  Replace all protective shields or safety notices

Brew cycle will not start 

1. No water  

2. No power or incorrect voltage to 
the brewer

3 .   S t r a i n e r / F l o w   C o n t r o l 
(.750GPM)

Water lines and valves to the brewer 
must be open.

Check circuit breakers or fuses.

(A) Direction of fl ow arrow must be 
pointing upwards in the brewer.

(B) Remove the strainer/fl ow con-
trol and check for obstructions. 
Clear or replace.

37235  050205