I have a 9 year old 3 Ton Goodman central heating and cooling system. The furnace is horizontal Goodman and is located in the attic. Last summer I had replaced the fan motor, compositor on the condenser. The whole system shuts off after a night of use. The first time I discovered the burned fuse and replaced it. After another days use the same thing has happened. I called a local Tech and he came over and replaced the fuse again and changed the filter, stating he couldn’t find anything else wrong with the unit. I was told by the tech that it could be because I had a dirty return filter, and that would cause the problem. I think this is a wiring problem but he couldn’t find any breaks in the wires. Also he suggested he chemical washes the coil because it’s very dirty. After a nights use on auto/cool, the fuse on the board burns out. Any suggestions?

After a nights use on auto/cool, the fuse on the board burns out. Any suggestions

You have a intermittent problem. Could be low voltage wires that have rubbed through somewhere. I do not believe a chemical wash is going to fix this problem so forget that until the low voltage electric problem is solved.

You will need a good ON SITE service person to figure this one out. There are items called tattle tails and other devices that a professional can use to help determine the cause of the problem.

hvac1000 is right on. This is definitely a low voltage problem, if in fact the fuse that blows is on the control board. If it's a three amp, then I would say it is. But please let me know where exactly the fuse is located.

hvac1000 is right on. this is definately a low voltage problem, if in fact the fuse that blows is on the control board. If its a three amp, then i would say it is. But please let me know where exactly the fuse is located.

The fuse is on the board.

Knowing if it only happens on cool would help.

The first thing to do in a case like this is to manually inspect the tsat, heater and outside unit connections and examine the wire where you can.