Gasboy CFN Series Diagnostic Manual - Manual (Page 221)

Pump Control Unit
12/26/02 6-31
Pump/Dispenser Will Not Reset When Authorized
MANUAL TEST: Place the pump override switch in the MAN position. Power to the pedestal
pump control unit must be on. Turn on the pump handle. If the pump resets,
go to AUTOMATIC TEST at the end of this section.
Possible Cause Checks Corrective Action
No AC feed to the
pump/dispenser. Check if the pump breaker is
off or tripped.
Check if 115 (230) VAC is
being switched through pump
breaker.
Check if 115VAC is measured
at the input side of the pump
relay power terminal block in
the PPC.
Turn breaker on, if off.
Replace breaker if 115 (230)
VAC is not being switched.
Repair wiring problem
between electric panel and
PPC if no input voltage is
measured.
No +12VDC relay drive
power. Check if +12VDC is
measured between pin 5
(black wire) and pin 2 (red
wire) of PPC Motherboard
connector P1. If +12VDC is
not measured, remove the
power supply enclosure cage
and check if +12VDC is
measured on both ends of
pico fuse F1.
Place the + meter probe on
pin 2 (red wire) of PPC
Motherboard connector P1.
Place the - meter probe on
the appropriate SUB, SLOW,
FAST relay drives on PPC
Motherboard connector P2.
If +12VDC is not measured
on either end of F1, replace
the PPC Power Supply PCB.
If +12VDC is measured on
only one end of F1, replace it
with a 1.5 Amp pico fuse.
If +12VDC is not measured
between P1, pin 2 and all
three relay drives, replace the
PPC Motherboard.
Defective relay. Measure between AC neutral
and the relay inputs (A, C, E)
and the relay outputs (B, D, F)
on the PPC relay bracket. If 115VAC is measured at a
relay input but not at its
corresponding output, replace
the relay.
Defective electric reset. Open AC junction box in
pump/dispenser. Measure
between FEED NEUTRAL
and RESET MOTOR FEED. If 115VAC is measured,
adjust, repair, or replace
electric reset.
If 115VAC is not measured,
repair wiring problem.