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.

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Originally Posted by mygirlsdad77

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.

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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.