Bunn CDBC Operating & Service Manual page 15

TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM
Spitting or excessive steaming
(cont.)
Brewer is making unusual noises
PROBABLE CAUSE
1. Lime build up on temperature
probe, tank or tank heater
2. Temperature Probe
3. Control Board
1. Plumbing lines
2. Water supply
3. Lime build up
Page 15
REMEDY
Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.
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°C) 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, reconnect
the J3 plug to the control board.
Set the temperature to 200°F(93°C).
Let tank temperature stabilize. If
temperature in tank is above tem-
perature setting by more than 7°F,
replace the control board. (See page
22)
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 in-
side of tank with a deliming agent, if
necessary.
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