Bunn CDBC Operating & Service Manual page 12

TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBLEM
Will not fill or refill
PROBABLE CAUSE
1. Power off to brewer
2. Water shut off
3. Display flashing
4. ON/OFF Switch
5. Lime build up on Probe
6. Refill Valve or Control Board
7. Water is too conductive for
proper operation when using the
factory setting of sensing thresh-
old.
Page 12
REMEDY
Press warmer switches on control
panel to determine if power is ON.
Make sure water is ON.
Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 21, or under top
lid of brewer).
Make sure ON/OFF Switch is "ON"
and indicator is lit.
Remove the Probe and check for
lime deposit on tip. Clean and
reinstall.
Disconnect the brewer from the
power source and remove wires
from refill valve coil. Check for
continuity across the terminals of
the solenoid coil. If continuity is
not present, replace the refill valve
(See page 29). If continuity is
present, the coil may be stuck
closed. Shut water off to brewer.
Set the ON/OFF switch to the "OFF"
position. Open the faucet and drain
water down in the tank until flow
stops or slows to a trickle. Attach
a voltmeter to the terminals of the
refill solenoid. Connect the brewer
to the power source. Press the
switch "ON". Within five seconds,
voltage should be present at the
solenoid terminals. If voltage is
not present, refer to the wiring
diagrams and check the wiring
harness.
Reset the Water Sensing Thresh-
old Adjustment Procedures on
page 9.
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