Bunn Fast Cup Series Service & Repair Manual page 11

TROUBLESHOOTING
MACHINE MESSAGES, SYMP-
TOMS and/or ACTIVE NOTICES
Hydraulic Module Active Notices
17. Fill Time Too Long or Low Water
Supply
18. Water Pump Blockage, Stalled, Low
Flow Supply or Flow Limit
PROBABLE CAUSE
a. Main water supply
b. Restricted Water Filtration System -
Filter Cartridge Replacement Overdue
c. Internal water pressure regulator, out
of adjustment, worn or failure
a. Extremely restricted brew chamber
filter screens
b. Restricted Coffee Solenoid Valves
(Chiller coffee valves too)
c. Restricted Dispense Nozzle
d. Flow Meter
e. Water pump
f. 48.0VDC Supply
11
REMEDY
a. Ensure main water supply is turned On
b. Replace water filter cartridge
c. Try adjusting regulator before replac-
ing regulator. Factory setting is 20psig.
Note: Regulator Specification is 1 -
25psig.
Approximate 20psig setting without
use of pressure gauge: Rotate handle
clockwise until it stops, rotate handle
counter clockwise 7 1/2 full turns and
tighten lock nut.
a. Perform cleaning procedure or replace
brew chamber filter screens
b. Replace or clean and rebuild solenoid
valves and check brew chamber filter
screens
c. Unscrew dispense nozzle, remove and
clean internal parts and brew chamber
filter screens
d. Enter Water System tab under Ser-
vice icon. Test flow meter operation by
activating Hot Water valve
e. Enter Water System tab under Service
icon. Test water pump by adjusting Wa-
ter Pump Rate to see increase in water
pressure psig
f. Ensure 48 V Led is illuminated on the
power Board
Continued >