Check all thermostats , check to be sure you have 220 volts coming into the machine. Use ohm meter & check from heater element to the heater case or cabinet to see if the element is grounded. Positive to element & Negative to case should show no ohms if it does it is shorted. Also heater circuit runs through a centrifical switch on the motor
so if the motor quits the heater shuts down so you don't have a fire. When the motor is not running the fan stops.
You could check this switch but it don't happen very often. check this switch last. Hope this will help you
SOURCE: wd640g washer dryer not drying
There have been several modifications to this appliance heater
assembly so it could be fitted with thermal fuse, thermostat or a
thermistor (temperature sensor) or a combination of these. You will need to have and be able to use a multimeter to test these items. Unplug the appliance from the wall socket and take the lid off.
First
thing to check with the meter is the element. On top of the heater box
(where the element is enclosed) look to see if you have a cable clamped
to the top. If you have, disconnect this and use a multimeter to check
if it's open circuit, if it is, it will need replacing as the thermal
fuse has gone.
If you don't have the piece of wire then look on top near the front for a thermostat.
Take the wires off and again use the multimeter to determine if this is open circuit.
Next, test it on K-ohms setting to see if you get a reading. It may be a thermistor.
Do the same with the other item about halfway back along the top of the heater box. The attached diagram has the items you are looking for, they are 518 and 521 on the diagram: Heater box exploded view
Hope helps.
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