Bunn CDBC Operating & Service Manual page 16

TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM
Spitting or excessive steaming
(cont.)
Brewer is making unusual noises
PROBABLE CAUSE
2. Temperature Probe
3. Control Board
1. Plumbing lines
2. Water supply
3. Lime build up
Page 16
REMEDY
Remove the probe from the grom-
met and submerge in a water bath
of approximately 70°F(21°C). Con-
nect 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°Cº the reading
should be 11.8k ± 2k OHMS, and
at 80°F(27°C) the reading should
be 9.3k ± 2k OHMS. If the probe is
within these parameters, recon-
nect the J3 plug to the control
board.
Set the temperature to 200°F
(93°C). Let tank temperature sta-
bilize. If temperature in tank is
above temperature setting by more
than 7°F(3.9°C), replace the con-
trol board.(See page 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.
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