Troubleshooting
MDE-5422B Latitude Owner’s Manual · January 2021 Page 8-1
8 – Troubleshooting
Error Possible Causes Recommended Actions
Pump does not start
after nozzle lift
Pump is in an error state Check if the keypad shows any errors. To
resolve the error, contact the Gilbarco ASC.
Mains power failure Confirm mains cable is connected according to
the connection diagram provided in the manual
and mains is ON.
Power switch malfunctioning Repair or replace the switch as required.
Low power supply Check if the supplied power has dipped below
the specified level in the manual.
Motor not operating, Hydraulics
Interface Board (HIB) relays malfunction
Check if the relay Light Emitting Diodes (LEDs)
are glowing. If not, replace the HIB board.
Nozzle switch cable disconnected Open the lower panel and check if the nozzle
boot switch cable is connected.
Nozzle boot activation lever malfunction Check if the spring loaded activation lever in
the nozzle boot is functioning and the spring
tension is adequate.
Burnt motor or thermostat stuck open Repair or replace the motor as required.
Slow or No Delivery Clogged filter, nozzle, or crushed hose Inlet and meter filters are not clogged. Nozzle
and hose are in good condition.
Proportional valve not operating Check the D56 and D55 LEDs. If LEDs are
glowing, F1 and F2 fuses are blown. Replace
the fuses.
Dirty pump strainer Clean the strainer thoroughly.
Air leak on suction side of pumping unit Check leak-proof functioning of suction union
(flexible inlet) and the strainer bowl.
Global Pumping Unit (GPU) check valve
malfunction
Check the valve. Replace if found to be
damaged/faulty.
Insufficient product in storage tank Check the underground tank. Pump should not
be allowed to run dry.
Reduced speed of motor due to low
voltage
Motor will pick-up rated speed as soon as the
normal voltage is restored.
Distributed fuel line (for 2-grade dual) Check if the inlet pipe is directly connected to
underground tank. It should not be shared.
Reduced pump speed-belt tension
(belt is too loose)
Adjust the belt tension.
Underground piping trouble (It should
be a minimum of one foot below the
ground surface)
To check the underground piping, refer to
MDE-5427 Latitude Installation Manual. Check
valve, filter, and leakage in the pipeline.
Meter is not dispensing
fuel as per Metrology
Guidelines
Improper calibration Re-calibrate the meter according to the
procedure.
Worn out meter parts Replace the meter.
Inaccurate calibration measure CAN Check if the calibration measuring CAN is free
from dent or defect. It is calibrated.
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