Bunn CDBC Operating & Service Manual page 16

TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
Spitting or excessive steaming
(cont.)
Brewer is making unusual noises
PROBABLE CAUSE
2a. Temperature Probe (CDBC)
2b. Temperature Probe (CEZ)
3. Control Board (CDBC & CEZ)
1. Plumbing lines
2. Water supply
3. Lime build up
Page 16
REMEDY
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.
Set the temperature to 200°F
(95°C). Let tank temperature sta-
bilize. If temperature in tank is
above temperature setting by more
than 7°F, replace the control
board.(See pages 22 & 23)
Plumbing lines should not rest on
the counter top.
The brewer must be connected to
a cold water supply.
Remove the tank lid and clean
inside of tank with a deliming agent,
if necessary.
29319 091203