You need to find the root cause of the blown fuse on the furnace circuit board before you cause damage to the unit.
Furnace blows fuse on circuit board.
The most probable of these are 1.
Here are a few of the most common problems.
In this case you should call an electrician.
Last guy replaced board already.
There could be several reasons why air conditioner keeps blowing fuse in circuit board.
This was done after i couldn t get an appointment soon enough for a.
First the bad.
Furnace blowing cold air.
Sometimes the blown fuse in the furnace comes from a malfunctioning transformer.
Make sure there is not chafed wires.
This is one of the most common reasons why the furnace fuse is blown.
Remove the service panel on the goodman unit 5 16 screws where the power comes in.
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.
Within a 1 5 secs after i push door switch in the 3 amp fuse blows.
The stat wire feeds up through the bottom access hole.
It isn t the hsi inducer or blower motor as these are all high voltage parts not low voltage.
So i m working on a sure comfort nat gas furnace.
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.
Your furnace s control board has a separate fuse that protects it from getting too hot.
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 that all check out.
The contractor may be hanging up or shorting.
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.
Amperage draw anything near the fuse rating would periodically blow a fuse.
Here s how to diagnose a low voltage short.
Blows the 3 amp fuse on the control board for my goodman ac unit.
Diy and save 300 500.
Check out this post.
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.
Is your furnace running but blowing cold air.
Or just throw parts at it.
The coil in the contractor is 24v.
