Bunn ULTRA-1 manual Troubleshooting, No Power

Models: ULTRA-1

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TROUBLESHOOTING

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

Call licensed

electrician for repair

No Power

Correct voltage

at outlet?

Yes

Yes

12vac to Control Board

at J5-8 & J5-20?

No

Yes

Replace Control

Board

Does Membrane

 

 

 

 

 

 

No

Switch test ok?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace Membrane

Switch

No

Replace

Transformer

12vac from secondary

of transformer?

Yes

Check main

wiring harness

14

41084 102709

 

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Bunn ULTRA-1 manual Troubleshooting, No Power