Overheat Thermostat - Midea CD400 Service Manual

XV. Overheat Thermostat
This thermostat is designed to prevent overheating of the heating element. The temperature limitation is
set at 115 . Below this limitation, the circuit is closed. Once the temperature rises above this limitation,
the circuit is cut, protecting the heating element from being burnt.
Steps for the check:
Remove the outer casing.
Remove the thermostat connecting wire and check with an ohmmeter whether the thermostat circuit is
closed in normal temperature and opened when temperature rises above 120 . If the result if positive,
the thermostat is normal. Otherwise, it fails and shall be replaced.
From the lower left side, you can see the thermostat at the end of the sump. Remove the nuts on the
thermostat mounting plate.
Remove the mounting plate and the thermostat.
Replace a new thermostat and add some heat conducting silicone grease to its end.
Wrench tight the nuts on the thermostat mounting plate and connect the thermostat connecting wires.
Replace the outer casing.
XVI. Water Temperature Thermostat
This thermostat (47) is designed to inspect the water temperature and control the heating element. The
temperature control point is set at 62
thermostat). The circuit is opened below this temperature and closed above it.
Steps for the check:
Remove the outer casing and bottom pan.
Remove the connecting wires behind the sump and check with an ohmmeter whether the thermostat
circuit is opened in normal temperature and closed when temperature rises above 67 . If the result if
positive, the thermostat is normal. Otherwise, it fails and shall be replaced.
Remove the screws and the mounting plate.
Replace a new thermostat and the mounting plate. The mounting plate shall press tight to prevent
water leakage at the thermostat end.
Replace the connecting wires, bottom pan and outer casing.
XVII. Dispenser
The dispenser (32) releases automatically the brightness liquid into the machine at the final rinsing stage.
The brightness liquid reduces the surface tension of the water and eliminates dirty spots from the dish
surface.
The dispenser can hold brightness liquid for one month use. At the final rinsing stage, the timer activates
the electromagnetic valve of the dispenser and pulls the rubber gasket of the valve core to release a
suitable amount of brightness liquid, which is carried away in the flowing water.
Steps for the check:
Check and replace the dispenser.
a. Turn the power switch to OFF, and pull out the power cord. Guard against sharp edge from cutting the
power cord.
b. Open the door, remove the four screws in the sides of the inner door, unscrew the knob cap of the
dispenser and the two locknuts, and remove the inner door.
c. Check the dispenser for any leakage or release of brightness liquid. If no brightness liquid is released,
check if there is brightness liquid in the dispenser. If there is brightness liquid in the dispenser, check
the terminals connected to the dispenser for looseness and fallout.
d. Pull out the two terminals of the connecting wire connected to the dispenser and remove the dispenser.
e. Check the electromagnetic valve of the dispenser with an ohmmeter. If the dispenser is broken,
replace it.
f. Connect the terminals of the connecting wire of the dispenser and replace the inner door.
g. Wrench tight the two locknuts and knob cap of the dispenser and check the dispenser for tightness.
(different temperatures are available and can be observed from the
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