Bunn Fast Cup Series Service & Repair Manual page 13

TROUBLESHOOTING
MACHINE MESSAGES, SYMP-
TOMS and/or ACTIVE NOTICES
Brew Module Active Notices
22. No Latch - the recipe does not allow
the entry of more than 45 grams
23. Swiper Not Found, Extend or Return
24. Piston Not Home,Timeout, Stall , No
Latch or Communication Error
PROBABLE CAUSE
a. Grinder adjustment change and/or
calibration is not correct
a. Check condition and cleanliness of
swiper
b. Swiper magnet missing or residue
blocking magnetic field
c. Swiper Switch
a. Check Piston Stop Points (*)
>Brew Piston Home - Status: *Home
>Brew Piston Top - Status:*Out of
Chamber
>Brew Piston Closed - Status:*In
Chamber
>Brew Piston Latch - Status:*Latched
> Brew Piston Bottom - Status -*Swiper
Remove
b. Proximity Sensor
13
REMEDY
a. Verify the grind coarseness and re-
calibrate grinder
a. Clean or replace swiper assembly
b. Clean swiper assembly
c. Enter Sensors tab under Service icon.
Check swiper status by viewing position
of swiper.
Not Home - Swiper should be in extended
forward position over brew chamber
At home - Swiper is retracted away from
the brew chamber
a. Enter Brew Module tab under Service
icon. Test piston operation & stop points
by touching each button to move piston
to each stop point. Ensure Piston Status
is correlated to the Piston Location mm
number.
Piston Location
Brew Piston Home - 0 mm
Brew Piston Top - 25 mm
Brew Piston Closed - 71 mm
Brew Piston Latch - 109 mm
Swiper Removal - 8 mm
Piston Not Home -If the piston is less than
or equal to 1mm and the home sensor
reads not home, go to Proximity Sensor.
Test the sensor with a metal to ensure
it can activate and be sensed to the
CBA. If needed, then adjust the actua-
tor post of the proximity sensor to
activate the home position at about
3-4mm or specification height of 1.0
inch from top of locator post to the
top of the sensor plate. Go to Proxim-
ity Sensor section for visual.
Sensor cannot see Home position,
replace proximity sensor.
Continued >