Panasonic Condensation Sensor Module for for WhisperGreen Select Exhaust Fan, FV-CSVK1

I bought the motion sensor & nite light options for my 6 WhisperCeiling fans for my house after getting tired of hearing a jet engine in my bathrooms for years( the replaced model was a Nutone..a cheap builder install) some noteworthy observations.1 : Motion sensor module: FV-MSVK1As mentioned previously depending on which model exhaust you buy …there may be two timers if you add the motion detector module.(built into the exhaust itself PLUS the Motion Sensor Module you added on). The motion detector timer ( has a fixed cut off time of 20 minutes. But, if you add the Multi-Speed w/Time Delay Module (FV-VS15VK1) there is a separate timer you can set the fan to stop after 0 to 60 minutes, and it overrides the motion detector setting.2: NightGlow LED Light Module: FV-NLVK1The dial only adjust the ambient light sensitivity to tell it when to turn on. It DOESNOT adjust the brightness or output of the light itself3: Condensation Sensor : FV-CSVK1When the condensation sensor is used in conjunction with Multi-Speed w/Time Delay Module (FV-VS15VK1) the fan kicks up to high speed when the sensor detects moisture depending on your CFM setting.If no other modules are install then fan will run when moisture is dectected & shut of automatically after 20 min later4: Multi-Speed w/Time Delay Module (FV-VS15VK1)You can set the CFM to 0 (zero) & then the fan ONLY comes on if motion is detectedOR set it at a continuous speed to NEVER turn offFan runs continuously at pre-set level, elevates to maximum level when a wall switch turns on OR detects motion OR condensation

I have a $19 digital weather station that measures humidity much more reliably than this $45 piece of junk--and the weather station measures indoor & outdoor temp, humidity, air pressure, plus tracks 24 hr highs and lows. All this switch needs to do is connect the circuit to turn the fan on at the humidity level you dial in, and then turn it off when the humidity falls below that level. And it completely fails at that task.The dial range runs from 30% to 80%, but not only is this a poor choice of humidity range, the sensor is incredibly inaccurate. The fan is always on if you set it even slightly below 80% (even though the reported humidity is under 30%--desert conditions). And most homes average around 50% humidity, so what good is any setting below 60%? It would be better if the range were 60% to 95% humidity--and even great if the sensor were able to measure within 10% of the actual humidity value!What does it do? Well, if you set it at the maximum humidity level (80%), the fan usually stays off if the humidity is below 50%. However, even at a 40% actual humidity level, if you walk into the room and simply sit and breath for about 30 seconds (the fan is in a small 7x7x8 bathroom), the fan turns on. If you then leave the room, the fan stays on for the next several hours until it randomly shuts off (even with the fan delay setting at 0). The fan will then turn on randomly with no one in the room and off again anywhere from 30 minutes to several hours later--and all this while the actual humidity level in that bathroom is under 50%.The only part of this sensor that does work is if it just happens to be off and you take a shower, the fan does turn on within a minute of starting the shower--at less than the 80% humidity that it is dialed to. Unfortunately, it won't shut off again for several hours after the humidity in the room drops below 50%. I have checked the sensor device, and there are no moisture drops in the sensor in that prevent it from shutting off, it just appears to be a poor sensor chip for this particular purpose.So, we haven't returned it for exactly one reason: it turns the fan on when you're in the shower and forgot to turn it on yourself before getting in (a common occurrence in our household). At least it is preventing the walls from dripping with moisture. I have to go around and turn the fans off manually after they've been running, but at least I can hear the fan and do something about it rather than the other option of having water running down the walls from condensation.The Panasonic fan that this sensor goes in is a very nice unit, and the idea of having a humidity sensor is a great idea. Unfortunately, this sensor is an expensive piece of junk. I would welcome Panasonic redesigning the sensor and sending me two free replacements. We have 4 of the fan units, two with the humidity sensors and both humidity sensors work exactly the same: very poorly.

There's a lot of negative reviews about this product causing the fan to run continuously, but I find it works great! I purchased the Panasonic FV-05-11VKS2 WhisperGreen Select Ventilation Fan with Sensor (50-80-110 CFM w/Sensor)- which means it comes with the FV-VS15VK1 Multi-Speed and Time Delay Module installed (this is necessary for the FV-CSVK1 Humidity Module to work correctly) . Together these work seamlessly to control the operation of the fan - either continuously at a selectable lower speed and at the higher speed (also selectable) whenever the humidity sensor detects a temperature/Relative Humidity (RH) setpoint (between 30% and 80% RH - again selectable) or you toggle the wall switch (if you elect to install one). There are numerous options to install the fan and modules - you can find and watch some YouTube videos on understanding how they operate (search for "Understanding WhisperGreen"), or simply ask a question and I'll be happy to help. Regardless, the fan and modules work great!

I have two of these sensors in two different fans, one of them is clearly bad. I've tried to interact for many months with Panasonic customer support and not only do they take forever to respond, when they finally do and confirm that you need a replacement, they quit responding and you have to start all the way over. I've done this three times. Finally I gave up and got Amazon to give me a refund. It's made me mad enough. I won't be buying Panasonic fans anymore...