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Split System Goodman GMP075-3 Rev A. Main Blower Fan will not turn on. Exterior Unit is running. Need schematic to debug.

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IF THE UNIT HAS A CONTROL BOARD ,POSSIBLE BAD FAN RELAY.TEST THE FAN CAPACITOR ALSO .IF NOT QUALIFIED CALL AN EXPERT THAT IS QUALIFIED.CHECK THE WIRING AT THE THEROMOSTAT FOR BAD CONNECTIONS

Posted on Aug 08, 2010

Testimonial: "Fan Capacitor was defective. Cheaper of the two choices so I tried it first... Thanks for the guidance."

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2 Answers

Wiring schematic goodman ph036a serial # 9610058720


Is condenser running? Verify amps to be sure both fan and compressor are operating. Should have 2 wires to compressor and 1 to fan on top of contactor. Then on the capactor (herm) terminal is the remaining compressor wire. On fan and c would be the 2 remaining wires for the outdoor fan motor. Then 1 more wire on c that jumps to the top of the contactor on the other side to which the first fan wire connects. GOOD LUCK.

Mar 19, 2017 | Goodman Heating & Cooling

1 Answer

Goodman AC fan outside runs, no air inside


You will need a new blower motor if the blower motor is not working. First check to see if the main breaker on the breaker panel is on and 240 volt power is available. If you have a split unit and it is installed in the attic, check to see if the overflow pan is full of water. Find the green control wire and see if it has 24 volts applied to the control card. If 24 volts are available to the control card and the blower motor is not running, you need to call a professional to check the fan control card. If 24 volts is not available to the control card in the air handler, then it may just be a loose green wire in the thermostat or maybe you may need to replace the thermostat if you you can not get 24 volts to the green wire. You can take cover off the thermostat and try jumping a small wire by touching it from the red wire to the green wire. The voltage on the control is only 24 volts on most home units. If this is a commercial unit, be cautious. I have seen 440 volt on one control system. Any voltage >50 volts is considered dangerous and you should consult a trained professional to perform the troubleshooting.
Hope this helps

Jun 23, 2014 | Goodman Heating & Cooling

1 Answer

My goodman split system AC unit is running but the fan won't run even when I switch it to fan on thermostat. Any ideas please?


Did you notice if there was a click at the blower cabinet when you were switching the fan switch back and forth? If it clicks you probably have a bad fan motor. If it doesnt you may a bad thermostat, relay or relay board. Hope this helps good luck

Aug 14, 2013 | Heating & Cooling

1 Answer

We have a goodman split unit, It was below freezing the other morning and the unit had a squeaking sound when it started up. Now it has warmed back up, the unit is sounding as if it's trying to kick off...


The symptoms seem to be related to the main blower motor and/or it's capacitor. Turn the system off for a couple of minutes and then turn just the fan on while the thermostats heat setting is in the off position. If the lights still dim then replace the motor and capacitor. The clicking noise is the fan relay.

Dec 17, 2010 | Goodman GMS807034ANA Heater

2 Answers

Hi,Ice on the suction and discharge line in LG split a/c. Please help me to clear this issue. Thanks.


Check and clean condenser coils with good coil cleaner
Put exterior fan on it to veify it.

If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas
imufo2@sbcglobal.net

Aug 22, 2010 | Goodman CKL30AR30 Air Conditioner

1 Answer

Goodman heat pump the fan runs but blows the 3amp fuse


The 3 amp fuse is for you're control voltage only, which is 24volts,ac. Something in the control side of your unit has a direct short in it. Since I am not on site to help you find out what part is at fault, I will give you some things to check out.You say you're indoor fan runs. I can only assume when you put the thermostat fan to on and not auto. Since this is a heat-pump, and not a gas fired unit, you will have a few less things that are 24volts.You say it blows the fuse on both heat and cool. You or someone that may give you a hand needs to do a process of elimination. What you will need to do, is to check all of the 24v. components to see which is at fault. The 24volts via relays and coils are what controls the motors, compressor, ect. We know that the indoor fan is good. I would be looking at the contacter coil first, even though the thermostat is 24volts. Since the contacter controls the condenser fan motor and compressor, my guess would be the coil on your contactor is shorted. I am not sure if you're heat-pump is a package unit or a split? Either way, you need to open up the control section of the compressor section which on a split its the outdoor unit. On a package unit, its where the main power enters. That would be on what ever kind of Goodman you may have, the 220volts come in and each of the 2 hot wires connect to the bottom of the contactor.What to do 1st.What ever it is, a split or a pack unit, turn off the main power to unit, split, outdoor unit, pack, whole unit.Even if this is a split system, when you turn the power off to the outdoor unit, you will still have 24volts to it when you turn the stat on.The 24 volts comes from the fan center on the indoor unit. With all of the power off, look at the contactor. On each side you will see 2 wires to a copper coil. Pull off these 2 wires, and dont let them touch anything even though they are dead.Turn power back on and check the 3 amp fuse. It should be fine. Now, with the power turned back on, touch these 2 wires back to the coil.This should blow the fuse. If it does, that contactor needs to be replaced.I know this is a lot to check, but I am sure the contactor coil is shorted. You will have to buy one from a retail appliance store. Every wire must be put back in its original place. If you don't think you can test this, I would advise calling someone out. I know this is a long solution, but i am sure that is the problem. Let me know please. Good Luck,
Shastalaker7
Ps an electrical meter would be of a lot of use to you. One more thing, if the copper coil on the contacter is burned and black, just turn off all power and replace it. I am certain this is your fault.

Nov 12, 2009 | Heating & Cooling

1 Answer

Split straight air system with outside unit comes on and air handler does not whether on auto or on position with temp down or up


Either the thermostat, fan relay on circut board or blower motor bad. Jumper the R and G terminals together on the circut board, depress the door switch and see if the blower runs, if not, check for power to motor, capacitor and motor windings. If it runs then you have tstat/control voltage wiring problem.

Jul 26, 2009 | Goodman Heating & Cooling

1 Answer

Inside blower not starting every time


You have a voltage bleed somewhere or a short, whatever you want to call it. Do you have a control board on this unit where the relays are integrated into it or do you have the old type where the relay is separate? Anyway, you need to take a meter and take voltage readings to the motor when it's acting up and when it's running right. I have had the same problem with a Goodman unit before and it turned out to be the tstat! What I would do is remove the cover off the tstat and take a small jumper wire and touch the r terminal to the y terminal. If the motor starts right up, you know it's the tstat. If you have the same problem, then the only thing it can be is a low voltage short to the unit from the tstat, bad control board if you have one, or a bad relay. But if the unit is working fine in heat, it's probably not the relay. I hope this helps.

Apr 08, 2009 | Goodman Heating & Cooling

1 Answer

New furnace, goodman and reinstalling squirrel cage... unsure where to put red wire running from squirrel cage


Follow your schematic on the new unit. It will tell you where the wire goes. Some of the "extra" wires are connected to the main board close to where the "used" wires are and they are labled "spare". Find the blower motor on the schematic and trace out where this wire will go.

Mar 19, 2009 | Goodman CLQ36AR49 Air Conditioner

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