Bunn TWIN APS - Manual (Page 15)

Page 15
TROUBLESHOOTING (cont.)
Spitting or excessive steaming
(cont.)
Brewer is making unusual noises
2. Temperature Probe
3. Control Board
1. Plumbing lines
2. Water supply
3. Lime build up
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, recon-
nect the J3 plug to the control
board.
Set the temperature to 200
°F
(95 °C). Let tank temperature sta-
bilize. If temperature in tank is
above temperature 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
inside of tank with a deliming agent,
if necessary.
PROBABLE CAUSE REMEDY
HEATING CIRCUIT
PROBLEM
36672 030104