My Goodman a/c unit will not turn on ..

Is this a new tstat? How about trying cooling with fan in on position , what happens? What is the model number of your indoor unit please.

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Should be a disconnect box next to unit. Heating is you have a heat strip is more likely in the attic close to the unti

the inside coil and outside unit should be matching in tonages another word if you have 2.5 ton outside the inside sould be the same. it don't matter what brand name or who made it.

There shouldn't be a reset switch. The only units I've ever seen or heard of having a reset switch were old Rheem condenser, they had a high pressure switch that you could reset by pressing a red plastic button, but even Rheems no longer have them and I've never heard of Goodman using them.

What problem are you having with your A/C system? And why are you looking for a reset for it? Please repost your question and give us a bit more info so that we may help you with your probelm.

1 posible cause.the thermostat supplies 24 volts to the outside unit to control the contactor if you hear a ligth huming on the outside unit this is the being activated. if this is the case then
check to see if any ants are in or around the unit see video, they will usually climb to dry areas before during or after a storm and for some reason they like the contactor if this is the case cut all power to the unit and clean contactor spray the area around the unit with an insecticide ( not the contactor) replace cover and test unit. Best of Luck.

two things to try first to get you pointed in the right direction. First disconnect the R or RH wire from the T-Stat. If the furnace turns off (Stops firing w/ fan to turn offabout 90 sec. later) then you more than likely have a bad Thermistat. If it continues to run Pull the R wire from the Furnace circuit board. put door back on furnace if it stops you have a short in the wire. Still Running? Most likely a bad curcuit board. Hope this helps.

If the outside fan works ,try to put a booster cap. in parallel with the capacitor , but if nothing works check the outside power supply box (or discennect) to see if a fuse is blown.

Goodman air handlers (inside unit) fan have a delay timer that turn on the fan ,sometimes up to 3 minutes after the outside unit is on,this makes the a/c more efficiency.

Check for burned wires at the outside unit and if the fan doesn't work could be the capacitor or the fan motor itself , i would try replacing the capacitor first is no more than $25.

Check the TXV valve on the outdoor unit, it could be stuck closed. We have been experiencing the same problems with the 410 systems and the TXV was the culprit. Good Luck