Anthony M Leesburg , VA September 09, 2014 Appliance: Frigidaire Wwh(V2) / Dehumidifier MED40P3 Frigidaire Dehumidifier Med40p3: The humidifier ran constantly. How to replace Humidistat Control. Replaced the humidistat and now it cycles properly under control of the humidistat. White-Westinghouse Dehumidifier Model MED40P3 5 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes