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Bunn espress™ model es•1a™ troubleshooting – Bunn ES.1A User Manual

Page 17

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15

BUNN

Espress™

Model

ES•1A™

TROUBLESHOOTING

Probable cause

Solenoid valve

Pump

Solenoid valve

Limit thermostat(s)

Tank heater

Remedy

Check voltage at terminals. If voltage is
present when the dose switch is pressed,
disconnect power supply, remove wires
from coil terminals and check coil termi-
nal continuity. If there is continuity re-
place solenoid.

When start switch is pressed, pump should
turn on immediately. If this dies not hap-
pen, check voltage at terminal block on the
pump. If correct voltage is present, use a
flat-blade screwdriver to turn the motor
shaft on the rear end of the motor to see if
the pump itself is locked up. If the shaft
does not turn, replace pump assembly.

Remove the solenoid valve and clear it of
any obstructions. Rebuild or replace the
valve if necessary.

Disconnect power supply , remove all wires
check across limit terminals for continuity.
If no continuity, replace limit thermostat(s).

Check tank heater terminals for correct
voltage. If voltage is present and machine
is not heating properly, replace tank heater.

Problem

Brew cycle will not
start (cont.)

Water is not hot or
long recovery time.