Bunn TWIN APS, Operating & Service Manual

Page: 16 / 32

Page 16
TROUBLESHOOTING (cont.)
PROBABLE CAUSE REMEDY
BREWING CIRCUIT
PROBLEM
Brew cycle will not start
1. Display flashing
2. No water
3. No power or incorrect voltage to
the brewer
4. ON/OFF switch not in the "ON"
position
5. Low water temperature (Brew
lockout is enabled)
6. Water not touching refill probe
inside tank
7. Switch panel
Brewer has shut down due to mal-
function (See Diagnostic Chart in
manual, Page 20, or under top lid
of brewer).
Water lines and valves to the
brewer must be open.
Check for voltage across the black
and white terminals at the termi-
nal block(s).
The indicator lamp must be lit
Allow brewer to heat until ready
lamp is lit, or disable the brew
lockout feature. (See page 7)
Press ON/OFF switch (indicator
must be lit). Brewer will refill until
water touches probe inside tank.
Water must be in contact with
refill probe before brew cycle will
start.
Disconnect the brewer from the
power source. Disconnect the rib-
bon connector from the control
board. Check for continuity be-
tween pins 1 & 2 (An arrow on the
connector indicates pin 1). No
continuity should be present. Press
the BREW switch. Continuity
should be present for as long as
the switch is held "ON". If no con-
tinuity is present, replace the
switch membrane decal. (See page
23)
36672 030104