Hi and welcome to FixYa, I am Kelly.
Often the reason ice makers slow or stop ice production is because the freezer compartment has gradually warmed up above 17 Deg F and the ice maker thermostat will not start an ice harvest cycle. What causes this gradual warming is usually the result of either an evaporator fan running slow or an automatic defrost circuit problem caused by a fault defrost timer/control defrost heating element or defrost thermostat / thermistor.
You can use this manual to troubleshoot the ice maker:
http://applianceassistant.com/pdf/inDoorIceSystem.pdf
or
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/8527f904cc8ea8cd85256b5800672333/$FILE/4322658A.pdf
Note that jumpering T to H requires the ice maker thermostat to sense a termp of 14 - 16 Deg F for the ice harvest cycle to start. If by jumpering T - H under the ice maker front cover the ice maker does not cycle then either the freezer compartment is too warm or the ice maker thermostat is bad.
If it cycles and does not add water... then the inlet water valve solenoid has failed or the ice maker module is not supplying power to the inlet water valve.
Thanks for choosing FixYa,
Kelly
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