I have a Zenith dehumidifier model zd300y0 and upon start up it displays 70% then instantly drops to 1% and shuts down. Is it this control board or the sensor?
Answer Hello Tom,
When the humidity starts high but the control suddenly drops, the sensor has failed. As per all of the information I could dig up, this can damage the control board. It is recommended to change the sensor and the control at the same time to avoid damage to either the new sensor or the new control as the sensor, when bad, can also damage the control.