9. With the correct model code displayed, press the SELECT
button. The electronic controller will restart, briefly display-
ing the model code you set.
10. Press the
p
UP or
q
DOWN buttons to set the present
time. Up moves the display ahead; down sets the time
back. Be sure AM or PM is correct.
11. Press the SELECT button a few times, until the time
appears on the display, but is not flashing.
12. For information about programming additional features of
the softener, consult your owner’s manual.
13. If the valve is not in Service position, press the RECHARGE
button and hold for 3 seconds to start a recharge cycle.
The display will flash “RECHARGE NOW.” In about 2 hours
the recharge cycle will be complete and the valve and elec-
tronic control board will be properly oriented together.
NOTE: To save time, use the manual advance procedures to
properly time and check operation. See service infor-
mation in the manual.
* Model codes o34, o40 and EPHy: This replacement controller has
a new feature that may not have been on your system before. Every
4 months, “CLEAn” is displayed as a reminder to use water softener
cleanser on your system. Press any button to clear this
display.
IMPORTANT: BE SURE THE VALVE CAM INDICATES “SERVICE”
POSITION (See Figure 1) WHEN REPLACING THE ELECTRONIC
CONTROL BOARD (PWA), TO ASSURE BOTH VALVE AND PWA
ARE ORIENTED, OR TIMED, TO THE SAME CYCLE. If the valve is
not in Service position, see step 13 below.
NOTE: When installing the electronic control board (PWA) on the
faceplate, use care not to twist the circuit board, or force it onto the
mounting pegs. Twisting could damage the printed circuits, or break
the display glass.
Model Number
Model Code
to select
M34 or EP34
o34*
EP40 or EP200
o40*
MSD34C Sr28
EPHY
EPHy*
MHY oHy
1. Unplug the water softener’s power supply.
2. Remove the faceplate cover to expose the valve.
3. Unplug the wiring connections from the back of the old
Electronic Control Board (See Figure 2).
4. Carefully remove the old board by unsnapping it from its
retainer tabs.
5. Carefully snap the new Electronic Control Board into the
retainer tabs.
6. Reconnect the wiring to the new board (See Figure 2).
7. Plug the power supply into the electrical outlet. A number
shows in the display for a few seconds, followed by flashing
“- - - - -”.
NOTE: If “- - - - -” is not flashing in the display, press and hold
the SELECT button until a model code appears.
8. Use the
p
UP or
q
DOWN buttons to set the correct model
code for your softener (see table below).
ELECTRONIC CONTROL BOARD (PWA) REPLACEMENT
7334620 (Rev. E 12/6/17)
Position markers
(valve in service)
CAM
MOTOR
Figure 1
Figure 3
UP
button
Display
DOWN
button
RECHARGE
button
SELECT
button
Low Salt
Indicator
Figure 2
Power
Supply
to Valve
Position Switch
to Valve
Motor
Back of Electronic
Control Board
to Turbine
Sensor
