Bunn FMD-5 User Manual

6

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 high voltage 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 fittings 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 unit is heated at all times. 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

Product will not dispense

1. No water  

2. No power or incorrect voltage to 

the dispenser

3. Dispense Switch

4. Digital Touch Control Switch

5. Dispense Solenoid Valve

6. Solenoid Valve (Inlet)

Water lines and valves to the dis-

penser must be open.

(A) Check for correct voltage to the 

dispenser.

(B) Check circuit breakers or fuses.

Refer to Service - Dispense Switch for 

testing procedure. See page 28

Refer to Service - Digital Touch 

Control Switch for testing procedure. 

See page 29 

Refer to Service - Dispense Solenoid 

Valve for testing procedures. See 

page 47

Refer to Service - Solenoid Valve 

(Inlet) for testing procedures. See 

page 49

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