G7129C sampler cooller error

I have a G7129C with problem. When the ALS is turned on, the red LED appears. Performing the sampler cooler test, it fails and shows a result comment: "invalid output value". By turning off the sampler control the error disappears. By disconnecting the sampler the error disappears. Is it a problem with the sampler or is it a problem with the main board? There is no error number in the test report

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