Control Board Diagnostics
332697C
29
Control Board Diagnostics
A60
NOTE:
Check for motor problems before replacing con-
trol board. A damaged motor may burn out a good con-
trol board.
Check for a damaged control board or pressure control
switch as follows:
1.
Relieve Pressure
(see
Pressure Relief Proce-
dure
, page 13).
2. Unplug electrical cord.
3. Remove four cover screws and front cover.
Remove motor enclosure.
4. Remove yoke and guide rods.
5. Remove gear.
6. Remove pressure control harness from control
board. Using tip of small, flat blade screwdriver,
press tab on right side connector to release.
7. Attach harness from a pressure control switch you
know is functioning correctly to control board.
NOTE:
Pressure control switch does not have to be
installed in pump.
8. Turn pressure control adjustment knob (C) +to max-
imum pressure setting.
9. Plug electrical cord into 240 VAC receptacle.
10. Turn power switch (B) ON.
•
If motor runs, replace failed pressure switch.
Pressure Control Switch Kit
. See
List of Kits
,
page 30.
•
If motor does not run, replace control board
repeat test.
Control Board Kit
. See
List of
Kits
, page 30.
A20, A30, and A45
NOTE:
Check for motor problems before replacing con-
trol board. A damaged motor may burn out a good con-
trol board.
1. Unplug electrical cord and
relieve pressure
(see
Pressure Relief Procedure
, page 13).
2. Remove enclosure and check all control board
connectors for proper installation (see
Wiring
Diagram
, page 53).
3. Check fuse on control board. If fuse is blown,
determine the cause before replacing control board
(see
Advanced Troubleshooting
, page 20).
