Model A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Gray screen ran Diag came up with 4sns/1/40000000:th00-9.000

I put a 2T HD hybrid and downloaded fan software work great for about 2 months then Gray screen ran D test came up with 4sns/1/40000000:th00-9.000 , what to do, can this be fixed by installing 2nd market sensor like, OWC,

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Thats a great problem for an it tech best of luck.


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2 Answers

That is the exact product you need, because that error code is for the HD Thermal sensor. Though I've never seen the grey screen problem before, let us know if installing that sensor fixes it.

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He may have cooked his system. This is one of the reasons using over-riding software is a bad idea! Either the system does not get enough cooling or you burnout the fan and then it cooks! Dammed both ways:-(


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This is a clear and 100% effective solution for all iMacs with 4SNS/1/40000000:TH00-9.000 problem after replacing a HDD:

Please note that Macs Fan Control DOESN'T solve the problem because you still have an error in Apple Hardware Test! Macs Fan Control does only control fan speeds and has nothing to do with a HDD temperature sensor detection.

My solution resolves all the issues after HDD replacing, like:

- Mac OS runs very slow,

- fans are running at the maximum speed,

- kernel task is equal or above 100% in Activity Monitor,

- AHT and ASD are reporting TH00 temperature sensor error.

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