Fault Code 51 - Wayne Vista Series Service

Failure Indication

Fault code 51*.

† To check for a defective Blend Motor disconnect the linkage between the blend motor and
blend valve. Initiate a dispenser reset by removing the nozzle and making a grade selection.
Observe the blend motor shaft for movement after making a grade selection. If the motor fails
to turn and probable causes 1 through 6 above have been eliminated, the blend motor and/or
the wiring between the blend motor and the solenoid drive board is likely to be defective.
*
To clear the error message it is necessary to either cycle the power to the Duplex Computer or enter option
99, change the data to 3 and exit option programming. Even if the problem is corrected the fault code will
continue to be displayed until one of the procedures mentioned above is executed.
54
Part No. 917543 Rev. A
Probable Cause
Blend ratio error exceeded programmed limits.
1. Flow restricted on
one end grade.
2. Binding of linkage
from blend motor to
blend valve.
3. Leak between
chambers in blend
valve.
4. Defective solenoid
drive board.
5. Defective F2 on
computer.
6. Defective computer.
7. Defective blend
motor. †
Corrective Action
Observe the blend valve while
dispensing to determine which
grade is restricted. As product is
dispensed the valve will move
towards either "HI OFF" or "LO
OFF". The opposite grade has the
restriction. Check all valves and
flow tubes for obstructions.
Clean strainer and change filter.
Check linkage for free movement
and interference from other parts.
Correct as necessary.
Replace "O"-ring between
chambers.Replace blend valve.
Replace the solenoid drive board.
Replace F2.
Replace computer.
Replace blend motor.
November 1992