Yep,could be,if fan is on.if nothing is comeing on,it is probbaly the low voltage.buuuuut first things first.you could get a big shock checking them.is there 220 getting to furnace?.is there 24 volts at transformer secondary?I check to see if coils are open first because you can do this with power off.is signal from thurmostat ok? I went on a call recently where they just needed new battery in thurmostat.good luck and don't get electrocuted.
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