Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 107)

GASBOY Series 1000
6-22 03/07/03
PUMP ALWAYS ON
Possible Cause Checks Corrective Action
Pump override switch is in
MANUAL position. Locate the proper pump
override switch in the Series
1000 post and check if it is in
the MANUAL (down) position. Place the pump override
switch in the AUTO position
(all the way up), if it is not in
AUTO.
The pump is being held on by
the PC PCB or MPU PCB Check if the relay LED on the
PC PCB is lit. Replace the PC PCB if the
relay LED is lit.
Replace the MPU PCB if the
relay LED is lit and replacing
the PC PCB did not correct the
problem.
Possible short providing pump
power. Turn off all breakers. Using an
ohmmeter, measure across
the A contacts, then the B
contacts of the pump power
terminal block in the Series
1000 post. If a short is
measured for either of the
contacts, remove the field
wiring from the pump power
terminal block and measure
each set of contacts again. Is
short measured again? Replace the pump override
switch if a short is measured
on either set of contacts.
Repair the pump wiring if no
short is measured after the
field wiring is removed from
the pump power terminal
block.
Power to pump is being
allowed by the PC PCB or
relays. Replace the PC PCB if the
pump is always on.
Replace the relays if the pump
is always on and replacing the
PC PCB did not correct the
problem.