Bunn CDBCF CDBCP - Manual (Page 15)

Page 15
TROUBLESHOOTING (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Water does not heat to proper
temperature (cont.)
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.
Spitting or excessive steaming
4a. Temperature Probe (CDBC)
4b. Temperature Probe (CEZ)
5. Limit Thermostat (all models)
6. Tank Heater (all models)
1. Lime build up on temperature
probe, tank or tank heater
A) Remove the probe from the
grommet and submerge in a water
bath of approximately 70
°
F(21
°
C).
Connect an ohmmeter to pins 3
and 4 of the J3 connector. At
60
°
F(16
°
C) the reading should be
15.3k
±
2k OHMS, at 70
°
F(21
°
C)
the reading should be 11.8k
±
2k
OHMS, and at 80
°
F(27
°
C) the read-
ing should be 9.3k
±
2k OHMS. If
the probe is within these param-
eters, reconnect the J3 plug to the
control board.
B) Remove the probe from the
grommet and submerge in a water
bath of approximately 70
°
F(21
°
C).
Connect an ohmmeter to pins 2
and 3 of the J5 connector. At
60
°
F(16
°
C) the reading should be
15.3k
±
2k OHMS, at 70
°
F(21
°
C)
the reading should be 11.8k
±
2k
OHMS, and at 80
°
F(27
°
C) the read-
ing should be 9.3k
±
2k OHMS. If
the probe is within these param-
eters, reconnect the J5 plug to the
control board.
Disconnect the brewer from the
power source. Check for continu-
ity across the limit thermostat ter-
minals. Continuity should be
present. If not replace the limit
thermostat.(See page 27)
Disconnect the brewer from the
power source. Check for continu-
ity between the white terminal of
the terminal block (or Red termi-
nal on 208/240 volt models) and
the black wire on the relay on the
control board. There should be a
low OHM reading. If no continuity
is present, check for a wiring prob-
lem, then replace the tank heater if
no wiring problem is found. (See
page 28)
Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.
HEATING CIRCUIT (cont.)
29079 042803