Air Does Not Flow Through One (or Both) Tubes When AERATE Button is Pressed
1 Remove the aeration tubing from the copper tubes (or tee) inside the control box. Press the AERATE button.
Air should blow through both tubes. If air blows through only one tube or the pump makes noise but air does
not come out of either tube, replace the pump. If air comes out of both tubes, skip to step 3.
2 If the pump does not make noise when the AERATE button is pressed, check to make sure the pump is getting
power. If the pump is getting power when the button is pressed, but does not operate, replace the pump.
3 If the pump is working normally, reconnect the tubing inside the control box. Press the AERATE button and
check for leaks in the aeration system. See the diagram on the following page.
Automatic Aeration Does Not Work, Manual (AERATE) Button Works OK
Remove the black wire from terminal 1 on the aeration timer. Disconnect the black wire from the aerator switch.
Plug the wire from the switch into terminal 1 of the timer. The air pump should immediately start pumping air into
the liner. If the pump works, replace the agitation timer. If the pump does not work, check the wiring between the
aeration timer and the pump.
Coffee Does Not Flow Back Into Gauge After Aeration
Older model urns are equipped with holes in the top of the copper tubes that feed air to the gauge assemblies.
See the diagram on the following page for location. Make sure that the holes are not covered by the silicone tubing
from the pump. If the holes are not exposed, coffee will not
n
ow back into the gauge after aeration.
Setting the Brew Timer (Brew Volume)
WARNING:
During programming, keep hands clear of all bare
wires/terminals. Touch only the control board. Keep all body
parts clear of the liner/spray arm to avoid scalding.
1 Remove the side cover from the control box. Power must be
connected and the water supply on. Turn the toggle switch on the
bottom of the control box ON.
2 Wait for the water jacket to
m
ll and heat.
3 Turn the batch selector switch to HALF BREW/ONE POUND.
4 Remove the lid and brew basket from the urn liner and swing the
spray arm into place.
5 Make sure the liner is empty.
6 Push and hold the programming button until the programming
LED
n
ashes.
7 Press the BREW button on the front panel.
8 When the liner is half full, press the BREW button again. Half
batch is now programmed.
9 Empty the liner.
10 Turn the batch selector switch to the FULL BREW or TWO
POUNDS position and repeat steps 4 through 9 when the brew
light comes back on, this time waiting for the liner to
m
ll all the way during programming.
TROUBLESHOOTING GUIDE
TG20
RU URN, CONTROL CIRCUIT, TROUBLESHOOTING GUIDE
ø
030921B
IMPORTANT:
On older units, when reconnecting the silicone tubing to the copper tubes inside the control
box, make sure that you do not cover the small holes on the copper tubes. See the diagram on the following
page.
INLET
VALV
E
LEVEL
HALF_SW
CO
MMON
NO
NC
BRE
W
_SW
PROBE
Programming
button (red)
Programming
LED
Control
board
Control
box