If the fuse blows when you have no low voltage wires hooked to the furnace then you have an internal problem like a bad limit gas valve connection or control board.
Furnace blows fuse on circuit board.
The furnace requires a lot of electricity to run and your home may not have the means to support it or there could be a short in the system.
Remove the service panel on the goodman unit 5 16 screws where the power comes in.
Within a 1 5 secs after i push door switch in the 3 amp fuse blows.
Amperage draw anything near the fuse rating would periodically blow a fuse.
You need to find the root cause of the blown fuse on the furnace circuit board before you cause damage to the unit.
First the bad.
Loose electrical cables there could be loose electrical cables inside the circuit box or somewhere in your ac which could be causing a short circuit.
The coil in the contractor is 24v.
Make sure there is not chafed wires.
Apparently theres been somebody else here already.
Furnace blowing cold air.
After resetting the circuit breaker and replacing the fuse if the fuse keeps blowing there might be an electrical short in the electrical system that supplies the electricity to the furnace.
So i m working on a sure comfort nat gas furnace.
This is one of the most common reasons why the furnace fuse is blown.
This was done after i couldn t get an appointment soon enough for a.
I ve removed low voltage wires coming from thermostat and ac unit and i ve removed the 9 pin connector for the 24 volt circuit within the furnace.
Here are a few of the most common problems.
There could be several reasons why air conditioner keeps blowing fuse in circuit board.
Last guy replaced board already.
If that all check out.
In this case you should call an electrician.
If someone is poking around your furnace and is not too careful they could more wires so that they come into contact with the furnace s wire frame causing them to short and blow the fuse on the furnace board.
If the fuse keeps popping in your air conditioner you have a 24 volt short.
The good news and bad news about electric furnace troubleshooting.
The most probable of these are 1.
Here s how to diagnose a low voltage short.
Or just throw parts at it.
Blows the 3 amp fuse on the control board for my goodman ac unit.
Check out this post.
Is your furnace running but blowing cold air.
Sometimes the blown fuse in the furnace comes from a malfunctioning transformer.
The stat wire feeds up through the bottom access hole.
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