Bunn New Infusion Series Programming Manual page 34

TROUBLESHOOTING (cont.)
PROBLEM
Water will not heat or display shows
HEATING TIME TOO LONG.
PROBABLE CAUSE
1. Limit Thermostat
2. Temperature probe
3. Tank heaters
4. Control Board
Page 34
REMEDY
Remove power from the brewer.
Check for continuity through the
limit thermostat. CAUTION: Do not
eliminate or bypass limit thermo-
stat. Use only replacement part
29329.0001.
Remove the probe from the grom-
met and submerge in a water bath
of approximately 70°F (21°C).
Connect an ohmmeter to the pins
in the 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
to the control board.
Remove power from the brewer.
Check for continuity through the
tank heaters. If no continuity is
present, check for a wiring problem
(consult wiring schematic), then
replace the tank heater if no wiring
problem is found.
Remove power from the brewer.
Connect a voltmeter across the tank
heater. Reapply power to the brewer
and refer to testing outputs. If the
voltage measured when the tank
heater is turned on is very low or
zero, then substitute a control board
know to be good working order.
53867 050117