Problems Starting A Fill - Compac CNG Service Manual

Problems Starting a Fill

Problems Starting a Fill
Problem
When the start button is
pressed the dispenser does not
888888
display and reset for
the next fill.
Gas will not flow
Compac Industries Ltd.
Likely Cause(s)
The dispenser hose numbers have not
been set.
The start button or nozzle switch is
faulty, stuck, or broken.
The connection between the forecourt
controller and dispenser
communications connection is faulty.
The C4000 Microprocessor Board is
faulty.
There is no power to the solenoid.
The solenoid coil is burnt out.
The solenoid valve is stuck
The check valve is stuck
The regulator piston is stuck
Water in the gas has turned to ice,
blocking the gas flow. (Wet gas causes
freezing blocks in cold conditions,
regardless of filtering.)
The Over-Pressure switch has been
activated (if present).
Page 76
Troubleshooting
Recommended Action
 Set the dispenser hose numbers.
Hose Number (see page 23)
 Check that the Diagnostic LED (D18)
flashes quickly when you operate the
start button or nozzle switch, to make
sure that the C4000 is registering the
button or switch.
 Check that the nozzle switch is
operating correctly and is not broken,
and that the mechanism is free to
move in and out.
 Replace the button or switch if
necessary.
Check the polling

communicator LEDs on the C4000 to
determine the quality
connection between the dispenser
and forecourt controller.
If none of the above suggestions

resolve the problem, replace the
C4000 Microprocessor Board. (see
page 62)
 Establish the reason why there is no
power to the solenoid from the
Solenoid Problem section (see page
79), and then implement
recommended action.
 Establish the reason for burn-out from
the Solenoid Problem section (see
page 79), and then implement the
recommended action.
 Clean the solenoid and replace the
valve seals.
 Clean the check valve and replace
the valve seals
 Clean the regulator and replace the
valve seals (see page 52).
 Pour boiling water onto the pipework
where the freezing has occurred until
the ice has thawed and the gas can
flow.
 Contact your gas supplier
 Check the pressure on the pressure
gauge.
If it exceeds 215 bar, the over-
pressure safety will have shut down
power to the solenoid but not the
electronics and metering.
 Clean the regulator and replace the
valve seals (see page 52).
 De-gas the dispenser to reduce the
pressure.
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