Service and Repair Manual

14
TROUBLESHOOTING
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 qualified service person-
nel.
• All electronic components have 120 volt ac and/or 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.
• Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the dispenser when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
No Power
Correct voltage
at outlet?
No Yes
Call licensed
electrician for repair
12vac to Control Board
at J5-8 & J5-20?
Yes No
Does Membrane
Switch test ok?
Yes
No
Replace Membrane
Switch
Replace Control
Board
12vac from secondary
of transformer?
No
Yes
Replace
Transformer
Check main
wiring harness
41084 102709