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The low voltage light/alarm is going off

When I turn on more than one light or attempt to run the furnace/heater the low voltage light/alarm goes off... I have a 2005 Terry RV

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Get your altenator and battery checked

Posted on Oct 31, 2012

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Is there a reset or an in line fuse ( a little glass fuse )? This is only indicating that you have power to the heater. If I were to guess I would say there is something between the high voltage and low voltage, usually manufacturers will put protection (a fuse ) on the low voltage side of your step down transformer. Remove the electrical cover after powering it down and trace the wires from the plug to the transformer looking for a reset or little glass fuse.

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Furnace not firing up...thermostat said low battery ...installed new batteries. Green (LED) light indicating power to thermostat is off. Furnace still doesn't fire up.


1) Turn the fan to on and if it runs you know that you have line
voltage to furnace and 24volts to the thermostat.

2) You could turn the furnace off remove the doors and get to the
control board. If you can find the Thermostat wires on the board
mark and remove them. If you have a typical Furnace and you
have some electrical background put a jumper wire between
terminals R and W,put the doors back on-there is a door switch
that if the panel is not put back on-it will not run. Turn your power
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3) The Blower motor may come on, the induced draft blower should
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4) If all of this happens, then you have a thermostat problem or you
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5) If nothing happens then you don`t have power to the furnace or the
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Good Luck

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Hi,
The chances are that the furnace was running when the power went out. This will cause the high limit switch to cutout and needs to be manually reset.
You will find that switch in the blower compartment near the blower. Usually somewher near the highest point of the cabinet.
Push the little red button firmly till it clicks.
When the power goes out while the furnace is running the heat builds up because the blower shuts down immediately and causes this limit switch to cut out.
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I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

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