Fix my dyson ph05

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My Dyson PH05 air purifier displayed an error with a purple 999 code on the screen.

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The manufacturer indicated that the issue was due to the need for a filter replacement. After purchasing and installing a new filter, the problem persisted. Upon disassembling the unit, I discovered that a sensor required cleaning. After cleaning the sensor with a hair dryer and reassembling the unit, the issue was resolved.

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When reinstalling, be extremely careful with the clips as they are made of plastic and can become brittle and break easily due to aging.