Air conditioner

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Old 07-21-17, 08:01 PM
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Air conditioner

3 amp fuse blows as soon as main power is turned on but blower keeps running even though the t-stat is on auto and cool off
 
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Old 07-21-17, 09:01 PM
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Welcome to the forums.

We need to know what you are working on there.
Is that a fuse in a furnace that's blowing ?

A make and model would be helpful.
Pictures are also very helpful. http://www.doityourself.com/forum/el...-pictures.html
 
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Old 07-22-17, 02:57 AM
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A lot of fan relays/controls are designed to fail in the closed position when power is removed, this is a safety feature. relay coil is energized with no call for fan, gets de-energized with call for fan. in de-energized state with no low voltage power.

bottom line? you have a short. how to troubleshoot depends on what kind of system you have.

do you have a meter that reads ohms?
 
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Old 07-26-17, 08:39 AM
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Thank you guys figure out the problem. The common wire is shorting out the 3 amp fuse, as soon as I disconnected it from the board it stayed on. It was a goodman furnace 90%. I have to run a new wire from the furnace to the thermostat.
 
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Old 07-26-17, 08:52 AM
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I doubt it's a bad cable. Does your thermostat use a C wire ?

If you have A/C with that furnace..... and only one C wire..... that wire is more likely for the outside condensor. There should be two cables with multiple wires. There would be two wires to a standard A/C condensor..... Y and C.
 
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