Hi and welcome to FixYa, I am Kelly.
Here is a Job Aid that will help you:
http://adcxns1.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/8527f904cc8ea8cd85256b5800672333/$FILE/4322658A.pdf
Testing the optics starts on page 25. You must follow the instructions verbatim as far as time lines or you will have to start the test over.
NOTE: There are 2 types of Optics. Pre 2002 and 2002 Optics. Make sure your performing that optic test that is a match for your unit.
Take a look at the charts on page 30. From here is appears that either the optics are blocked or
the emitter board has failed. Do the tests and follow the troubleshooting procedures to confirm this.
Thanks for choosing FixYa,
Kelly
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