T315 sensor gives wrong humidity readind

T315 sensor gives wrong humidity readind

T315 sensor gives wrong humidity readind
T315 sensor gives wrong humidity readind
2025-05-21 13:31:38 - last edited 2025-06-05 02:57:54
Model: Tapo T315  
Hardware Version: V1
Firmware Version: Latest

I bought this to monitor temperature and humidity in a holiday home while I am away. It seemed to work ok at first, but while away it gave humidity readings up to 82%, which had me worried. I am at the house now with a dehumidifier but it reads 70% when my weather station tells me the humidity is 50 %. The tapo t315 seems to be 20% high when estimating humidity. Is there a solution? Or is this sensor likely to be faulty?

 

I have four T315s at my permanent home and they all work fine.

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Re:T315 sensor gives wrong humidity readind-Solution
2025-05-22 03:12:19 - last edited 2025-06-05 02:57:54

  @apbliv 

 

It's normal for humidity levels to differ in various locations. For example, even in the same room, you might see significant variations in temperature and humidity data near windows, bathrooms, under beds, and close to appliances.

 

For this situation, I recommend checking if the sensor's vent is aimed at areas with noticeable humidity changes. 

 

The humidity readings from your dehumidifier and the weather station also differ greatly, so that's not really a solid reason to question the sensor's accuracy. For a proper comparison, it's best to use the same type of device and place it in the same spot for testing.

Tapo P110M Matter 1.3 Release Energy Monitoring through Matter ▶ Smart HomeBase Tapo H500 - Even More Powerful Smart Hub ▶ First Smart Switch Module! Tapo S112 Smart Switch Module with Roller and Switch Dual ModesTapo Camera Image Style & Image Brightness Try out a different image style for your camera!
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Re:T315 sensor gives wrong humidity readind-Solution
2025-05-30 20:09:59 - last edited 2025-06-05 02:58:12

 Ok, I have checked some things. The sensor is consistent with the 4 T315s I have in the UK. It is also consistent with a vaillant Hest Pump controller and a klimalogg pro sensor. It is 7% higher than a weather station at home. I guess that means the sensor is working ok and the humidity in my holiday home is much higher than I thought (hoped!).

thank you for your help on this.

Alan

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Re:T315 sensor gives wrong humidity readind-Solution
2025-05-22 03:12:19 - last edited 2025-06-05 02:57:54

  @apbliv 

 

It's normal for humidity levels to differ in various locations. For example, even in the same room, you might see significant variations in temperature and humidity data near windows, bathrooms, under beds, and close to appliances.

 

For this situation, I recommend checking if the sensor's vent is aimed at areas with noticeable humidity changes. 

 

The humidity readings from your dehumidifier and the weather station also differ greatly, so that's not really a solid reason to question the sensor's accuracy. For a proper comparison, it's best to use the same type of device and place it in the same spot for testing.

Tapo P110M Matter 1.3 Release Energy Monitoring through Matter ▶ Smart HomeBase Tapo H500 - Even More Powerful Smart Hub ▶ First Smart Switch Module! Tapo S112 Smart Switch Module with Roller and Switch Dual ModesTapo Camera Image Style & Image Brightness Try out a different image style for your camera!
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Re:T315 sensor gives wrong humidity readind
2025-05-22 20:14:21

Hi Wayne

thanks for the reply. I can't check against another T315 until I get back home. However, I did test against two external origin weather station units. Today was very sunny and warm, so I put the two origin sensors and the T315 in the same place outside my south-facing kitchen window - shade and sun. Both origin sensors indicated 18% and the T315 indicated 40%. It is now back indoors right next to the base weather station and reads 63% (still creeping up) against 45% on the weather station. I will take the T315 home with me and compare against my 4 other ones.

Akan

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Re:T315 sensor gives wrong humidity readind
2025-05-26 08:57:01

  @apbliv 

 

Sure. Look forward to your updates!

Tapo P110M Matter 1.3 Release Energy Monitoring through Matter ▶ Smart HomeBase Tapo H500 - Even More Powerful Smart Hub ▶ First Smart Switch Module! Tapo S112 Smart Switch Module with Roller and Switch Dual ModesTapo Camera Image Style & Image Brightness Try out a different image style for your camera!
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Re:T315 sensor gives wrong humidity readind-Solution
2025-05-30 20:09:59 - last edited 2025-06-05 02:58:12

 Ok, I have checked some things. The sensor is consistent with the 4 T315s I have in the UK. It is also consistent with a vaillant Hest Pump controller and a klimalogg pro sensor. It is 7% higher than a weather station at home. I guess that means the sensor is working ok and the humidity in my holiday home is much higher than I thought (hoped!).

thank you for your help on this.

Alan

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Re:T315 sensor gives wrong humidity readind
2025-06-05 02:57:48

  @apbliv 

 

Thank you for the update, it's glad to know that!

Tapo P110M Matter 1.3 Release Energy Monitoring through Matter ▶ Smart HomeBase Tapo H500 - Even More Powerful Smart Hub ▶ First Smart Switch Module! Tapo S112 Smart Switch Module with Roller and Switch Dual ModesTapo Camera Image Style & Image Brightness Try out a different image style for your camera!
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Re:T315 sensor gives wrong humidity reading
2025-06-17 14:01:35

Hi Wayne

I have one further question. If I post this sensor to my neighbour without the batteries in, so he can put it back in the house, will the sensor lose its settings without batteries powering it?

I would like him to be able to put new batteries in and have the sensor remember the Hub it was connected to. If the settings get lost, then I will have to wait until I visit again.

Thanks

Alan

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Re:T315 sensor gives wrong humidity reading
2025-06-19 07:53:17

apbliv wrote

Hi Wayne

I have one further question. If I post this sensor to my neighbour without the batteries in, so he can put it back in the house, will the sensor lose its settings without batteries powering it?

I would like him to be able to put new batteries in and have the sensor remember the Hub it was connected to. If the settings get lost, then I will have to wait until I visit again.

Thanks

Alan

  @apbliv 

 

Short-term data can be stored in the sensor itself, but will be erased once the sensor reboots, unless the data has been synced to the hub. Rebooting the sensor won't delete device configurations like its network source (connected hub), device name, notification, automation, etc, erase all device settings require a factory reset.

Tapo P110M Matter 1.3 Release Energy Monitoring through Matter ▶ Smart HomeBase Tapo H500 - Even More Powerful Smart Hub ▶ First Smart Switch Module! Tapo S112 Smart Switch Module with Roller and Switch Dual ModesTapo Camera Image Style & Image Brightness Try out a different image style for your camera!
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Re:T315 sensor gives wrong humidity readind
2025-06-19 10:47:55

OK. I guess that automated answer means that if I post the devive to France without batteries inserted, it will remember the Hub etc when it gets there and the batteries are re-inserted.

Thanks.

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