Bunn ES.1A - Manual (Page 16)

BUNN Espress™ Model ES•1A™
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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 at 1-800-637-8606.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service
personnel.
• 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 brewer is heated at all times unless disconnected from the power source. Keep away from
combustibles.
• All electronic components have 120 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.
WARNINGS
• Exercise extreme caution when servicing electrical equipment.
• Disconnect the brewer from the power source when servicing, except when specified.
• Follow recommended service procedures.
• Replace all protective shields and safety notices.
TROUBLESHOOTING
Problem
Equipment will not
operate
Brew cycle will not start
Pushing any of the
automatic batch buttons
results in only a short
flash of the brew light.
Will not brew. Continu-
ous brew works as well
as automatic refill.
Probable cause
No power or incorrect
voltage
Toggle switch (Master
on/off)
No water
Water strainer or water
conditioner
Dose sizes were set
with a defective flowme-
ter. The result was no
flow pulses reached the
electronic controller.
during the dose size
programming.
Remedy
Connect the brewer to the power
source. Check for proper voltages.
Check circuit breaker/fuse.
Must be in the on position. Pilot
lamp will light.
Check plumbing and shut off
valves.
Direction of flow arrows must be
pointing toward the brewer.
Remove the strainer and/or filter
cartridge of the water conditioner
and check for obstructions. Clear
or replace.
Replace flowmeter. Repair loose
connector in wiring between
flowmeter and electronic controller.