Recently remodeled our bathrooms. The master bath has a small water closet. We installed a Panasonic exhaust fan. Over the past 2 months it will randomly not turn on. A few days later it will operate until some unknown event causes it to not turn on again. It's has a humidity sensor in it. Our contractor initially set that to 80%.

He was over today trying to figure out what is causing the issue. All the electrical connections are working/installed properly. He set the humidity sensor to the lowest level and the fan works every time the switch is turned on.

Has anyone else had this issue? Should I just leave it at that new setting or replace the fan?

Is the humidity sensor built into the fan or part of the switch?

It's built into the fan. It's on a small knob that allows you to adjust the % from 0% to 80%.

Then there is a slider that allows you to set how quiet the fan is when the switch is turned on. The slider was set to low. It will slowly increase in velocity over a few minutes. You can set that to very low or to the highest level or anywhere in between. We tested that and those settings did not effect whether the fan turned on or not. Changing the humidity sensor knob from 80% to 0% had an immediate effect as the fan turned on and is operational.

Cooler weather keeping the humidity down?

That's my guess as it seems to not work when it's cooler.

I think it makes more sense to have control over the fan personally. If anything I'd prefer a timer over a humidistat sensor.

evan_aggie said:

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I think it makes more sense to have control over the fan personally. If anything I'd prefer a timer over a humidistat sensor.

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In the water closet, most definitely. Humidity swings won't be enough to make it work correctly.

If it were over/near the shower, humidity based control would make more sense. Leave it on all the time and let the humidity swings operate the fan.