Furnace Control Board Fuse Keeps Blowing

If you haven t been diligent about maintaining your furnace all its parts will have been silently and steadily collecting debris and dust.

Furnace control board fuse keeps blowing.

The contractor may be hanging up or shorting. Furthermore i would remove all the control wires from the board. If it is a low voltage fuse problem then you have a low voltage short somewhere. Im going to show you how to fix this problem with just a screwdriver and maybe 5 3 amp fuses and we will fix the 3 amp short im just making this video for my.

1 point 3 years ago. Here s how to diagnose a low voltage short. Or just throw parts at it. Make sure you have a good fuse and then reattach them one at a time.

The coil in the contractor is 24v. Regularly tripping the fuse can be a fire risk because it indicates an electrical problem. 4 points 3 years ago. When your furnace keeps blowing a fuse you need to take action quickly.

It isn t the hsi inducer or blower motor as these are all high voltage parts not low voltage. But for those who ve recently encountered one common issue a furnace blowing its fuse before scheduling that tune up it may be due to one or more of the following reasons. Replacing the fuse or resetting the breaker can temporarily fix the problem but if the underlying issue is not fixed the fuse will just blow again. If your furnace is blowing a fuse repeatedly leaving you with no power to the furnace your first step should be to call in an experienced hvac repair professional.

Most of the time low voltage shorts are in the thermostat wires. Fuse on the circuit board blowing in your case you likely have a dead short somewhere in the wiring or a bad load that is going short to ground causing the fuse to blow. Assuming this is a fuse on the low voltage side coming off the 24 volt transformer it s possible the contactor in your condensing unit has shorted out causing it to blow the fuse. I am guessing that you are referring to the fuse on your control board is blowing and not the high voltage fuse blowing.

Amperage draw anything near the fuse rating would periodically blow a fuse.