Bunn ES.1A Coffeemaker User Manual


 
BUNN Espress™ Model ES•1A™
14
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.