Bunn T3 Service Manual download pdf (Page 4)

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 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 dispenser is heated at all times. Keep away from combustibles.

WARNING

• Exercise extreme caution when servicing electrical equipment.

• Disconnect dispenser from the power source when servicing, except when electrical tests are speciﬁ ed.

• Follow recommended service procedures

• Replace all protective shields or safety notices

FAULT CODES

When a fault occurs (failure to the unit) the POWER lamp will ﬂ ash to identify the problem.

Flashes Description of Failure

1 Temperature Sensor (short)

2 Temperature Sensor (open)

3 Reﬁ ll Fault (continuous reﬁ ll for 15 minutes)

4 Heater Fault (heater relay on for 120 minutes)

5 Boil Thermistor (short) H5X/H10X only

6 Boil Thermistor (open) H5X/H10X only

Problem

Equipment will not operate.

Probable Cause

1. No power or incorrect voltage

Remedy

(A) Check the terminal block for the cor-

rect voltage. It should be:

a.) 100 to 120 volts ac across the black

and white terminals for 100 to 120 volt

models or,

b.) 200 to 240 volts ac across the red and

black terminals for 200 to 240 volt models

or,

c.) 230 volts ac across the red and black

terminals for 230 volt models.

(B) Check circuit breakers or fuses.

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Bunn T3 Service Manual Page 4

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