Check if the water tank level sensor is electrically OK.
I can't find a parts list for the model but presumably it is a float switch of some kind so it will either test short circuit when it is operated or open circuit when it is operated.
If may be easier to test it from where it connects to the control board, but maybe not i.e. if it is connected by a cable, disconnect the cable from the control board and use the Ohmmeter function of a DMM (digital multimeter) connected to the cable from the water level switch to test the operation of the switch when it is manually operated and released.
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If the switch is faulty, hopefully there's some model/part identification information on the switch itself, making it easier to find a replacement.
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Do this with the power disconnected from the dehumidifier.
@english60530
Check if the water tank level sensor is electrically OK.
I can't find a parts list for the model but presumably it is a float switch of some kind so it will either test short circuit when it is operated or open circuit when it is operated.
If may be easier to test it from where it connects to the control board, but maybe not i.e. if it is connected by a cable, disconnect the cable from the control board and use the Ohmmeter function of a DMM (digital multimeter) connected to the cable from the water level switch to test the operation of the switch when it is manually operated and released.
Do this with the power disconnected from the dehumidifier.