# Errant readings, cleaned sensors, now reading are off

**URL:** <https://community.purpleair.com/t/errant-readings-cleaned-sensors-now-reading-are-off/6832>\
**Category:** Troubleshooting\
**Created:** [October 3, 2023, 6:07pm UTC](https://community.purpleair.com/t/errant-readings-cleaned-sensors-now-reading-are-off/6832 "2023-10-03T18:07:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![FriendlyFred](https://avatars.discourse-cdn.com/v4/letter/f/5fc32e/32.png) [@FriendlyFred](https://community.purpleair.com/u/FriendlyFred)\
**Post date:** [October 3, 2023, 6:07pm UTC](https://community.purpleair.com/t/errant-readings-cleaned-sensors-now-reading-are-off/6832/1 "2023-10-03T18:07:22Z")

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Noted sensor was sort of greyed out. Researched that it might need to be cleaned. Pulled it apart to remove spider webs and gently used dry computer air to blow dust off and through the sensors. Reassembled and installed sensor to where it is mounted. It has been reading 100+ points above other local sensors.  
It has a 60% rating for trusting reading. I have a PA-II with firmware 7.02

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**Author:** ![Brian\_PurpleAir](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/brian_purpleair/32/2898_2.png) [@Brian\_PurpleAir](https://community.purpleair.com/u/Brian_PurpleAir)\
**Post date:** [October 4, 2023, 4:31pm UTC](https://community.purpleair.com/t/errant-readings-cleaned-sensors-now-reading-are-off/6832/2 "2023-10-04T16:31:05Z")

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Hello @FriendlyFred

Thank you for taking those steps to help clean the sensor. This might need some extra help from our support team. If you can send us an email to [contact@purpleair.com](mailto:contact@purpleair.com) with the device ID and what has been going on, we will be able to investigate further.

Thank you for being apart of the PurpleAir Community.