Bunn Single TF DBC, Инструкция по установке и эксплуатации

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Page 42
Troubleshooting Procedure
TROUBLESHOOTING (cont.)
Problem
Possible Cause
Check the sensitivity setting. Refer
to the
Refill function on page 28. If
the left three digit number is less
than the right number, the machine
“thinks” it is full and the refill valve
should be off. If the left number is
larger than the right, then the refill
valve will automatically be turned on
to fill the tank. The right number is
the threshold setting and can be
adjusted to compensate for extreme
water conditions: very pure, low
conductance water requires a higher
setting, while high mineral content,
high conductance water requires a
lower setting. Note that the left num-
ber changes from a high value when
water is NOT touching the refill probe
to a low value when water IS touch-
ing the probe. For best operation,
the right number should be set to a
value midway between these low
and high numbers. Before changing
the setting, confirm that the refill
probe is free of scale buildup and the
connection to it is secure.
Test the Refill valve. Refer to Testing
Individual Components on page 33
When this condition occurs, the
brewer will display OVERFLOW CUP
FULL. EMPTY CUP. The reason for
overfilling could be a defective refill
valve, an incorrect sensitivity set-
ting, (see above) or boiling.
Substitute a control board known to
be in good working order.
Foreign material lodged in valve,
holding it in open state.
3. Refill Probe or Sensitivity
Setting
4. Refill Valve
5. Overflow Protection Switch
6. Electronic Control Board
1. Refill valve
Automatic refill will not operate or
display shows FILL TIME TOO LONG
(cont.)
Water flows into tank continuously
with power removed from brewer.
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