Author Topic: Ecowitt WH41 Air Quality Sensor (PM2.5) only reading low  (Read 137 times)

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Offline theslydog

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Ecowitt WH41 Air Quality Sensor (PM2.5) only reading low
« on: April 26, 2021, 06:41:50 PM »
Has anyone run into this problem?

I have a Ecowitt WH41 and it is just sitting on 3-4ug/m3 no matter what the actual AQI is.

IE there is currently a fire in our area and a hand held is reading 100ug/m3 similar to the offical AQI website but the Ecowitt is reading 3ug/m3.

Is there any reset or a part than can be replaced?

Or is the unit now US?

The Unit was purchased in the middle of 2019 and seems to have started this behavior b4 Christmas.

Offline davidefa

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Re: Ecowitt WH41 Air Quality Sensor (PM2.5) only reading low
« Reply #1 on: April 27, 2021, 10:23:43 AM »
I don't know if this is your case but I stumbled in this video ( as I was searching how to mount my PMS7003 to prevent dust build up on the sensor )
Even tough the WH41 sensor is different, these low cost sensors are similar, so the problem could be dust build up, a malfunctioning fan...

P.S. I don't know how to trust a sensor after such a cleaning...
P.P.S. Here a small comparison of a few sensor, the oldest sensors show sign of 'fatigue'
So this is to be expected with time...
« Last Edit: April 27, 2021, 10:34:57 AM by davidefa »