Bunn TWIN APS Operating & Service Manual page 12

TROUBLESHOOTING (cont.)
REFILL CIRCUIT (cont.)
PROBLEM
Fill or refill does not shut "OFF"
(ON/OFF Switch "OFF")
PROBABLE CAUSE
2. Water Level Probe Sensing Sys-
tem
3. Refill valve or control board
4. Water is too conductive for proper
operation when using the factory
setting of sensing threshold.
1. Refill valve or control board
Page 12
REMEDY
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 grom-
met. Check for continuity from the
outside surface of the temperature
probe and pin 4 of the plug, conti-
nuity should be present. Connect
the J3 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.
(See page 22) If water flow does not
stop, repair or replace the refill so-
lenoid. (See page 28)
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. (See page 28) If
the valve closes when power is re-
moved, replace the control board.
(See page 22)
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