Bunn TU3QF-EZ Operating & Service Manual page 13

TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM
Spitting or excessive steaming
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 13
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. Connect an
ohmmeter to pins 2 and 3 of the J5
connector. At 60°F the reading
should be 15.3k ± 2k OHMS, at
70°F the reading should be 11.8k ±
2k OHMS, and at 80°F the reading
should be 9.3k ± 2k OHMS. If the
probe is within these parameters,
reconnect the J5 plug to the con-
trol board.
Set the temperature to 205°F. Let
tank temperature stabilize. If tem-
perature in tank is above tempera-
ture setting by more than 7°F, re-
place the control board. See page
25
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.
33030 052600