Goodman Furnace/AC unit not working 3a fuse blows even after replacement. once thermostat is turned on and clicks to start ac unit the fuse blows

the fuse is located in the circuit board in the blower compartment and the roll-out is located in the burner section and can be a reset-able switch style or the one time fuse link style which is a a small silver cylinder and is mounted in a ceramic piece and is held in with one screw. Both of these are mounted around the opening of the your burner assembly near the opening. This will be near the area of the gas valve.

Hello, sounds like something is shorting to ground, make sure all the low voltage wire are secure at tne indoor unit and the outdoor unit, also check the thermostat wiring all the way from tne outdoor unit to the indoor unit aor any cuts or missing insulation.

I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.

Look at the contactor on the condensing unit, remove the low voltage wires to the contactor and turn on the system. If the low voltage fuse doesn't blow, replace the contactor.

their is a control short some place check the control wiring . dog or rodents chewing threw it or shorted controls or thermostat id get service. Tom

my guess would be a problem with the low voltage wiring a short have it checked out by an electrician

double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again

Only 2 wires going outside.
Yellow from the thermostat and the common wire from the lv side of the transformer.

Clicking sound is the contactor engaging to start the outside unit. Check for a burnt off wire at the contactor. For some reason you are not getting power to the outside unit. If you find a burnt off wire shut off all power to it then remake the connection at the point of the circuit break.

This fuse is used on the low voltage side of the furnace. All 24 volt controls operate thru it. You may have a short in your thermostst, thermostat wire or even a bad transformer. After replacing the fuse, inspect the wiring in the cabinet as well as the wire heading toward the thermostat for damage. If you find none, check the thermostat for loose wires or contacts. If all else fails, jump out R and W with a small jumper temporarly at the furnace and see if the unit runs. You will have to tape the door switch closed to run it with the panel off. Remember, this will keep the furnace running 100% of the time until you disconnect the jumpers. Not a solution, just a test! If it runs flawless, you have a bad thermostat or wire. Diagnosing a transformer is for a technician.