Bunn CDBCF Airpot Operating & Service Manual page 12

TROUBLESHOOTING (cont.)
REFILL CIRCUIT (cont.)
PROBLEM
Fill or refill does not shut "OFF" (ON/
OFF Switch "ON") (cont)
Fill or refill does not shut "OFF" (ON/
OFF Switch "OFF")
PROBABLE CAUSE
2a. Water Level Probe Sensing
System (CDBC-APS/TS/TSR)
2b. Water Level Probe Sensing Sys-
tem (CEZ-APS/TC/TS/TSR)
3. Refill valve or control board
(CDBC-APS/TC/TS/TSR & CEZ-
APS/TS/TSR)
4. Water is too conductive for proper
operation when using the factory
setting of sensing threshold. (CDBC-
APS/TC/TS/TSR)
1. Refill valve or control board
(CDBC-APS/TC/TS/TSR & CEZ-
APS/TS/TSR)
Page 12
REMEDY
A) Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the nut
on top of the level probe to pin 1 of
the plug, continuity should be
present. Pull the temperature probe
up about an inch from the grommet.
Check for continuity from the
outside surface of the temperature
probe and pin 4 of the plug,
continuity should be present.
Connect the J3 plug to the control
board and proceed to step 3.
B) Disconnect the brewer from the
power source. Disconnect the J5
connector from the control board.
Check for continuity from the nut
on top of the level probe to pin 5 of
the plug, continuity should be
present. Pull the temperature probe
up about an inch from the grom-
met. Check for continuity from the
outside surface of the temperature
probe and pin 2 of the plug, conti-
nuity should be present. Connect
the J5 plug to the control board and
proceed to step 3.
Press ON/OFF switch to "ON" (Indi-
cator lamp should be lit). If water
continuously flows out of air vent
tube, disconnect the brewer from
the power source. If water flow
stops, replace the control board. If
water flow does not stop, repair or
replace the refill solenoid. (See page
30)
Reset the Water Sensing Threshold
Adjustment Procedures on page 9.
If water continuously flows out of
air vent tube, disconnect the brewer
from the power source. If water
flow does not stop, repair or replace
the refill solenoid. If the valve closes
when power is removed, replace
the control board. (See pages 21 &
22)
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