{"id":782,"date":"2023-12-25T11:00:00","date_gmt":"2023-12-25T17:00:00","guid":{"rendered":"https:\/\/www.moonsair.com\/blog\/?p=782"},"modified":"2023-12-22T15:32:53","modified_gmt":"2023-12-22T21:32:53","slug":"last-heater-repair-you-saw-coming","status":"publish","type":"post","link":"https:\/\/www.moonsair.com\/blog\/heating-service\/last-heater-repair-you-saw-coming\/","title":{"rendered":"This Is the Last Heater Repair You Saw Coming"},"content":{"rendered":"
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Your heater hasn\u2019t acted up in a bit. Repairs have been kept to a minimum, your maintenance goes on as planned, but there\u2019s one type of repair that most homeowners never see coming: your furnace\u2019s board suddenly reversing its polarity of incoming power.<\/p>\n\n\n\n

It sounds odd, because it is <\/em>odd. It\u2019s not a common heater repair in Shreveport, LA<\/a> by a long shot, but it happens. Today, we\u2019re going to talk about what it is, how it impacts your furnace, and how we can fix it.<\/p>\n\n\n\n\n\n\n\n

A Polarizing Problem<\/h2>\n\n\n\n

Electricity has polarity, much like magnets do. Just like you have a positive magnet (one that pulls) and a negative magnet (one that forces itself away from another magnet), you also have positive and negative electrons.<\/p>\n\n\n\n

The wires in your furnace are set up specifically. You have three wires connected to your furnace. One is neutral, so we won\u2019t cover that, but the other two are \u201chot wires.\u201d These carry electricity from one place to another.<\/p>\n\n\n\n

This isn\u2019t a problem for everyone, however, because a 240V connection is what\u2019s called polarity agnostic. But a 120V connection, which you would have going to a furnace in an RV or a mobile home (even if it\u2019s affixed on cinder blocks and stilts), is susceptible to this polarizing problem.<\/p>\n\n\n\n

Why Does It Happen in the First Place?<\/h2>\n\n\n\n

Usually, this is because it was installed incorrectly. But if it\u2019s a new issue on an older furnace, it could be because the circuit board gets wet or receives a power surge and gets damaged. It usually comes down to the circuit board in one way or another.<\/p>\n\n\n\n

The Fix<\/h2>\n\n\n\n

The polarity of the incoming main power is specific, so when the circuit board malfunctions and flips it, the main fix is to switch it back to its original polarity. There are two ways to do this:<\/p>\n\n\n\n