Question about Heating & Cooling
Reverse polarity means the power wires coming to the furnace are connected backwards. The black wire should the hot ( 120 volt line) . The white wire should be the neutral. The green should be the ground. Check these connections and test them to make sure they are correct. You should get 120 volt reading between the black and white.120 volts between the black and green and 0 volts between the white and green. Hope this helps.
Posted on Jan 02, 2014
Testimonial: "the only thing I don't get is if I shut the power of to it and leave it for a while it will come on it ran all night lastnight and now I cant get it to work for anything what would cause this the motherboard or what ever you call it was just changed Tuesday morning and it was working fine now the reverse polarity code if flashing"
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Posted on Jan 02, 2017
The voltage regulator on the control module is sending the wrong voltage to the ignitor or the ignitor is getting wet from condensation. That ignitor should last many years. Replace the control module.
Posted on Dec 04, 2008
SOURCE: reverse polarity
Its a simple fix. Follow the cord that plugs into the wall into the furnace. Or if its hard wire, follow the romex wire that goes into your furnace. Inside the furnace, switch the white and black wires that connects to the power cord. www.fastacservice.com
Posted on Oct 18, 2009
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