Grindmaster FDD2500-1-3A-B, Руководство по обслуживанию

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Page 12 Model FDD2500
Troubleshooting Guide
NOTE: The LCD display provides diagnostic feedback for determining the cause of fault or abnormal conditions. Error codes listed below are
stored in the controller memory and can be retrieved through the programming menu. Additional diagnostic LEDs are located on the controller
located behind the right side panel. See wiring schematics for LED locations and descriptions. Disconnect power before servicing machine.
Failure to do so can result in risk of electric shock.
Problem Possible Cause Solution
LCD display not illumi-
nated
• Power switch turned “OFF”
• No power supplied to machine
• Ground Fault Circuit Interrupter (GFCI)
has tripped
• Machine control transformer circuit breaker
has tripped
• Fuse has blown.
• Faulty wiring connections
• Press and release “I/O” button located under the display.
• Turn power switch “ON”.
• Ensure machine is plugged in at wall socket.
• Reset GFCI (if applicable) at power outlet
• Check if green LED is illuminated on control board located behind
right panel. If LED is not illuminated, reset the control transformer
circuit breaker located next to the
control board.
NOTE: An overload condition can
reoccur. The overload
condition must be diagnosed and
corrected.
• Replace fuse. (see figure on right)
• Ensure all wiring connectors are
plugged into display board and
control board correctly. Check if any
wires have pulled loose from termi-
nals.
LCD display shows error code (i.e. SC 1, 2, 3, etc.)
SC1: No Water Pressure
This feature is disabled and should not appear.
SC2: Reset Power • A fault condition described below has
occurred requiring power to be reset to
machine.
1) Water tank fill circuit has exceeded the
maximum run time (5 minutes)
2) A water tank overflow condition has
occurred
3) A water tank heating condition has
exceeded the water tank temperature set
point due to:
• Welded contacts on heater contactor
• For #1-3, turn power switch OFF for 5 seconds, then ON.
• Call Technical Service for assistance.
SC3: Low Water Level • Machine is filling the water tank
• Faulty water inlet valve electrical connections
• Faulty water inlet valve
• Insufficient water flow rate to machine (typically
during dispensing only).
• Allow machine to fill the water tank
• Ensure electrical leads are properly made to water inlet valve
• Check for power across water inlet valve terminals. If power is not
detected, replace water inlet valve.
• Allow water tank to fill. If problem continues, check for restrictions in
water line and check for proper water pressure (20-100 psi).
SC4: Thermistor Fail • Thermistor is disconnected
• Thermistor was subjected to sudden
temperature change (i.e. filling or
draining tank)
• Thermistor resistance valve is out of
“valid” range
• Check thermistor wiring connections
• Allow water temperature to stabilize, reset power to machine.
• Reset power first, if continues, check thermistor resistance (consult
factory for details), replace if necessary
SC6: Check Heating Water temperature has increased above set
point due to:
• Abnormal increase or decrease in water tank
temperature
• Welded contacts on heater contactor.
• Inlet water temperature must be below temperature set point
of water tank
• Check heater contactor for welded contacts, replace contactor if
necessary
SC9: Overflow condition • Water inlet valve weeping (leaking valve seal)
• Water inlet valve stuck open
• Loose water level probe connection • Replace inlet valve
• Replace inlet valve
• Check connection to water level probe
Add Product • Hopper is empty
• Hopper is disengaged
• Capacitive sensor needs to be adjusted • Fill hopper
• Make sure hopper is properly in place
• See “Add Product” Adjustment section on page 9.
Fuse
#63395