Bunn CDBCF Airpot Operating & Service Manual page 13

TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
Water does not heat to proper
temperature
IMPORTANT: Make sure no tem-
perature tests are taken before the
ready light is "ON". Tank tempera-
ture must be stabilized before read-
ings are taken.
PROBABLE CAUSE
1. Display flashing (CDBC-APS/TC/
TS/TSR) or ready light flashing
(CEZ-APS/TS/TSR)
2. Water not touching temperature
probe
3a. Dry Plug In Probe Sensing Sys-
tem (CDBC-APS/TC/TS/TSR)
3b. Dry Plug In Probe Sensing Sys-
tem (CEZ-APS/TS/TSR)
Page 13
REMEDY
Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 19, or under top
lid).
Remove probe and grommet. Look
into hole on tank lid. Water must be
within one inch from top of tank.
A) Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the tank
mounting screw where the green
wire mounts, to pin 2 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
4a.
B) Disconnect the brewer from the
power source. Disconnect the J5
connector from the control board.
Check for continuity from the tank
mounting screw where the green
wire mounts, to pin 4 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 2
of the plug, continuity should be
present. Connect the J5 plug to the
control board and proceed to step
4b.
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