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My heat pump blew a fuse,when i flipped it back on it now read "Auxillary Heat" on my thermostat

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  • sarachmom64 Dec 26, 2008

    I am also having a simular problem Our heat pump will alternate between heat (I have it set on auto.) and aux. heat. It's been extremely cold (between 5-20 degrees) for almost 2 weeks now. Is there something wrong with the unit or is this normal because it is so cold out? I have it set between 71-73 degrees.

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Thats because the temperature was was more than 2 degrees below the set point and that engaged the second stage heat. Thanks for using FixYa.

Posted on Dec 25, 2008

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Your thermostat can get power from either of two power souces. Primary power would be 24 VAC from a transformer mounted inside your air handler. Second (optional) power may be provided from battery backup, with the batteries mounted inside the thermostat itself.

Since your display went completely blank, then I would venture to guess that it is related to the 24 VAC circuit, sourced from the air handler. You probably do not have battery back up. Use a DVOM (Digital Volt Ohm Meter) to measure the RED wire connected to your thermostat. Make sure to use the VAC setting on the DVOM.

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If you have breakers, then flip all of your breakers off and then back on. Stay near the breaker box and wait for a minute, listening/looking to see if any breaker has tripped or if a fuse has blown. Otherwise, if the circuit is fused, then examine or test the fuse. Again, use your DVOM, this time in the Ohms setting. Zero Ohms indicate the fuse is good. A very high Ohms reading is a blown fuse (infinite resistance) In this case, verify that the blown fuse is the CORRECT value. Maybe it isn't. Replace it with the correct amperage fuse. Again, wait a few moments and see if it the new fuse blows.

If either the new fuse immediately blows, or if the flipped breaker immediately trips, then STOP and call a professional. You have a high-power wiring problem. Call around, and find an expert. It could be that a mouse chewed thru some insullation. You don't know, but don't be sold on replacing an expensive component without verifiable proof of the source of the problem.

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If the circuit is on a breaker, then just replace it. They really do go bad after a while. Pop the old breaker out and bring it with you to the hardware store. Replace it with the correct brand, amperage, and configuration.

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Hey Crystakwi, lets find out why with the informations you gave! this got to be a heat pump,-- up flow--you live in a cold climate--probably in the upper United States--! The Heat pump takes the heat out of the air down to 40*, then the auxillary heat kicks in , or you can just turn the thermostat to auxillary heat and it will kick in the back up heater, whethet it be gas heat --oil-- or electric heat to provide the heat from any degrees out side temperatures. Its cool , its just doing it job! Thank-you- very- much!

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