Inlet Valve - Midea CD400 Service Manual

X. Option Switch and Power Switch
The option switch and power switch are push-button switches. Abrasion and use after an extensive period
may cause switch failure. When the switch is pressed, the power or high temperature pilot will not light up.
Check the power switch or the option switch.
Steps for the check:
Turn all the switches to OFF and pull out the power cord plug.
Remove the outer casing.
Press the power or option switch and check with an ohmmeter whether the normally open terminal
is closed. If it is not closed, replace the switch.
Remove the control panel, unscrew the screws to remove the defect switch, and replace with a new
one.
Connect the wires behind the switch and check if they are connected fast.
Replace the control panel and the outer casing.
XI. Inlet Valve
The inlet valve controls the water volume into the dishwasher. The electromagnetic valve is fixed on the
valve base. When it is powered, a magnetic field will come and pull the valve core to let in the water.
The feeding of the water depends on the timer, which controls the opening of the electromagnetic valve.
In normal circumstance, the pressurein the inner container of the dishwasher shall be 78 85mm above the
sump bottom. Open the door to check the pressurewhen water is filled.
During the washing operation, the inlet valve may open to add some water.
Steps for the check:
Check and replace the inlet valve.
a. Turn the power of the dishwasher to OFF, and pull out the power cord plug (guard against sharp edge
from hurting the power cord).
b. Check with an ohmmeter as instructed.
c. Remove the outer casing and the rear panel.
d. Check the connecting wire of the inlet valve for looseness and the valve for crevice.
e. Check the connection of the inlet hose.
f. If the incoming pressurein the water tank is lower than the normal level, remove the inlet hose, clean,
or, if necessary, replace the filter screen, and reconnect the inlet hose.
g. Check the inlet valve terminals with an ohmmeter. The probes should touch the terminals of the inlet
valve. If the pointer does not move, replace the inlet valve with a new one.
h. When replacing the inlet valve, turn down the water tap and remove the wedge and the connecting
tube.
j. Unscrew the screws in the inlet valve support (96), replace the inlet valve with a new one, and
reconnect the tube and wire. Connect the inlet hose when the dishwasher is ready.
XII. Protection Pressure Switch and Working Pressure Switch
The pressurecontrol of the dishwasher is realized through a float pressure switch composed of two micro
switches. The larger contact current (10A) controls the working level and the smaller current (3A) controls
the protection level. The working level is set at 78 85mm above the sump bottom, and the protection level
is 3mm or more below the brink of the inner container.
The check and adjustment of the pressure switch:
I
f pressure switch trouble is suspected, check whether the dishwasher is set level. If it is in level
position, remove the outer casing.
Add water to the inner container, and check whether the float and lever is choked. In case of
choking, correct it.
If the working pressure switch remains placid when the pressurein the water tank rises over 94mm,
the switch might be obstructed by the lever or damaged. In case of damaged switch, replace it.
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