Bunn W/SMART FUNNEL S/N SNG0033000 & UP - Manual (Page 45)

Page 45
Troubleshooting Procedure
TROUBLESHOOTING (cont.)
Problem
Possible Cause
Check the sensitivity setting. Refer
to the Refill function. 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
number changes from a high value
when water is NOT touching the refill
probe to a low value when water IS
touching the probe. For best opera-
tion, 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.
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 setting,
(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 Set-
ting
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.
35879.1 071405