frenzal rhomb Posted December 16, 2014 Share Posted December 16, 2014 My air conditioning unit is turned off at the fuse box -( winter in PA ). However, I went out this morning and heard a loud buzzing coming from inside the unit. The fan is not spinning and the heat is actually on in house. This isnt a heat pump,it is a standard air conditioner unit - I have two zones so one unit per and it appears to be the upstairs unit. I have an HVAC guy coming out but they cant get here for two days. My big concern is why would it be buzzing when the power at the fuse box is off? Anyone have a clue what I'm looking at here? Thanks Quote Link to comment Share on other sites More sharing options...
Donutrun Jellies Posted December 20, 2014 Share Posted December 20, 2014 Cold bored squirrel with a kazoo? Quote Link to comment Share on other sites More sharing options...
moneymakers Posted December 21, 2014 Share Posted December 21, 2014 (edited) contactor - getting low voltage from transformer. it on a separate breaker/fuse this is just a guess without actually looking at the unit. Edited December 21, 2014 by moneymakers Quote Link to comment Share on other sites More sharing options...
frenzal rhomb Posted December 22, 2014 Author Share Posted December 22, 2014 Actually bad thermostat - 24 volt sending message to the unit to run even though the heat was on. New thermostat solved the problm - Quote Link to comment Share on other sites More sharing options...
BA Baracus Posted January 3, 2015 Share Posted January 3, 2015 What moneymakers said had some truth. While the contactor wasn't bad, it was most certainly the source of the buzzing. The bad stat was sending the signal to turn on the unit which had the contactor pulled in. No current from the main breaker = no unit running. Glad you got it nipped. Wish I would have visited here sooner to be of actual help rather than retrospective chit chat. Quote Link to comment Share on other sites More sharing options...
frenzal rhomb Posted January 6, 2015 Author Share Posted January 6, 2015 That's cool, BA. I would have had the tech in anyway to be certain. Just wanted to at least have a potential idea what I was looking at when they arrived - thanks Quote Link to comment Share on other sites More sharing options...
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