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The 3 amp fuse is in the red low voltage (24 volt) thermostat wire
and only gets power when the thermostat is set to turn on heat or a/c It should be connected to the red wire from the thermostat
There should be a short circuited component/s at its main power regulator board. Check and replace it. If
you're sound in electronics, and wish to get more details, check this
link.http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
/ Flip card, can be selected by the drop-down list, by the top left
of the display window, will make surf easy. You can also do a search, by type in the brand name / model
number / IC used, in the search box at the top right of the display
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You can take each thermostat wire off the control board and use a ohm meter and test to ground, should not have any resistance. Another way is turn off power take each wire off the board, then place one wire at back on the control board terminals ome at a time, untill the one you get to the one that blows the fuse. If the wires check out good sometimes the thermostat itself can have a internal short and cause the fuse to blow.
disconnect the thernostat wires from the control board. Put a jumper wire between R & G put door back on and turn on power. Blower motor
should run, if it blows the fuse then you have a direct short between R &
G at the board. Do this with R and W(heat) and R & Y(cool).
By disconnecting the thermostat wires and reinserting them make sure that they do not touch when inserted into each terminal. If it still blows
that little 3amp fuse when jumpering between each sequence as mentioned above, then I think your board is bad. When Jumpering out the Y terminal you will have to have the AC wires still hooked up. If it
blows the fuse in that sequence. Disconnect the wires out at the condensor.
Its not what it controls but what it protects. It protects
the transformer. Disconnect the thermostat wires and mark where they go. Replace the fuse and turn the power on. If it does not blow the fuse the problem is in
your thermostat or thermostat wires.
when a fuse blows, its telling you that theres a fault. this could be a loose or broken wire.
or alternatively, the fuse rating is too low. you could check the wires are tight. and also possibly try fitting a 5 amp fuse. check first that the fuse is rated correctly for the appliance. usually 3-5 or 13 Amps.
Sounds like the power surge may have blown the fuse in the TV. You can replace the fuse and see if that works.
If not, more damage to the power supply unit may have occurred.
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