The sensor relay is closed but the deicing system is not running. Why?
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The heating system will be supplied by a different breaker that the one supplying power to the sensor. Make sure that this load breaker is closed.
Are you using a sensor load contactor? Confirm that this contactor is working properly.
Check to see if any included thermal overloads are not tripped.
You might also find some additional helpful information by clicking on the following URL:
http://www.doityourself.com/stry/troubleshooting-common-magnetic-contactor-problems#b
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