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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 – 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 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 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 specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
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.
42311 071310
When a fault occurs (failure to the unit) the POWER lamp will
flash to identify the problem (early models)
Flashes Description of Failure
1 Temperature Sensor (short)
2 Temperature Sensor (open)
3 Refill Fault (continuous refill 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
FAULT CODES
Er1 Temperature Sensor (short)
Er2 Temperature Sensor (open)
Er3 Refill Fault (continuous refill for 15 minutes)
Er4 Heater Fault (heater relay on for 120 minutes)
Er5 Boil Thermistor (short) H5X/H10X only)
Er6 Boil Thermistor (open) H5X/H10X only)