Valve Repair; Water Distribution - Maytag MFS25PN Service Manual

reducing the pressure in the plunger area.
The water pressure from the supply forces
the diaphragm (H) to open and allows the
water to run under the diaphragm through
the outlet of the valve.
When the predetermined water level is
reached, the solenoid is de-energized and the
plunger spring (A) pushes the plunger (B)
back into the diaphragm opening. Water is
forced through pilot hole (C) until equal
pressure is attained on both sides of the
diaphragm, thus stopping the flow of water
through the valve.
Some of the valves might have a flow control
(F,E) mounted in the inlet and outlet. This
flow control will give a constant flow through
the valve independent of the water pressure.
Service Tips:
If the valve does not open or close, check the
following:
Use caution when working with live circuits.
1. Check power to the solenoid - use voltme-
ter. Check for abnormal drop in voltage.
2. Check the solenoid for short circuit or
failure in the coil.
3. Check that the water pressure corre-
sponds to the rated pressure of the valve.
4. Check the filter screen in the water inlet
and clean if necessary.
5. Check the pilot hole in the diaphragm to
be sure it is not closed by foreign
particles.
6. Check plunger and diaphragm for
damage.
7. Check to see that the pilot hole in the
diaphragm is positioned over the water
inlet opening in the valve body. When
replacing diaphragm, see that the pilot
hole is in the correct position.
8. Make sure you have the correct replace-
ment valve for the model you are
servicing.
Valve Repair
In most cases, only the diaphragms require
replacement. Valve diaphragm kits provide a
means for quick repair of these valves.
Disconnect from power supply.
1. Push upward on the base of the solenoid
to release from valve guide tube.
2. Turn valve guide tube to gain access to
diaphragm.
Water Distribution
MFS50 models:
There are two inlets for water in the ma-
chine: one hot and one cold.
The cold water connection is made to a
manifold that has the following valves
attached:
YV2 Cold fill (Inlet 2 when
programming control board)
YV5 Supply 1
YV6 Supply 2
YV7 Supply 3
YV8 Supply 4
YV9 Supply 5
YV10 Cool down
The hot water connection is made to a single
valve: YV3 Hot fill (Inlet 3 when program-
ming control board)
Listed below are the locations for the flush
points of each valve:
Valve Flush Point
YV2 & Supply box (lower right side, below
YV3 supply cups)
YV5
Supply box compartment 1 (far left side
of supply box)
YV6
Supply box'compartment 2 (far left side
of supply box)
YV7
Supply box compartment 3 (far left side
of supply box)
YV8
Supply box compartment 4 (far left side
of supply box)
YV9
Supply box compartment 5 (far left side
of supply box)
YV10
Supply box (lower right side, below
supply cups)
16009607
Section 2. Service Procedures
©1999 Maytag Appliances Sales Company
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