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Goodman GMP125 - 5

On a call for cooling the condenser starts and then the indoor fan comes on after a few seconds the indoor fan shuts off and then comes back on again and it keeps repating this. The control board red indicator light does blink 4 times when the fan goes off indicating there is a limit open. I only see a limit switch on the R leg coming from the transformer. I don't see anything else that would make the fan go on/off continuously. Any suggestions?

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  • 182 Answers

It could be a broken wire or bad control board.A popped roll out switch could cause this also

Posted on Aug 06, 2008

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2 Answers

Condencer runs for 20 sec then off keeps repeting after 2 or 3 min goodman central system


Seems like it trying to start and then cuts out , possibly on overload. Try the machine on fan blow only , that will check the indoor unit to see if that is working. Then try cool or heat function while listening to the machine starting. If you hear a loud humming just as the fan starts, and then it cuts out, It could be a compressor issue. Possibly the start capacitor has failed.

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1 Answer

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Seems like the fan relay has stuck (Likely to be on the main indoor PC board) or if the machine was being used on heating mode, the indoor pipe sensor may have failed causing the fan to continue to run. Most air cons on heating mode, will keep the fan running for a few minutes after you switch off on heating mode to cool down the indoor unit before it turns off completely. The pipe sensor signals the main PC board to tell it that the unit has cooled down and can now turn off completely. If either of the above faults occur, the indoor fan will keep running all the time.

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Goodman heatpump fan runs, condenser wont start


Either the condenser fan has bad bearings, or it has a defective fan capacitor.
Turn off the breaker to the outside unit.
Spin the fan blade by hand.
If the fan blade spins easily and will spin a few revolutions with no problem the fan bearings are good.
If not, replace the fan motor due to bad bearings.
I am pretty sure you fan motor is bad because with a bad capacitor the fan motor will not get up to speed and may just sit and overheat.
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Sep 27, 2012 | Goodman Manufacturing Goodman GSC130301...

1 Answer

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! shut it down but leave the indoor fan on. check the filters and replace as needed. It also appears the drain is plugged or iced up. If ou can access the indoor coil you can service the drain and run some hot water thru the pan that catches the condensate. If you can see your indoor coil and you see a "lint blanket" on the indoor coil you will have to vacume it off as well. I hope this helps let me know Jon

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1 Answer

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Hi, I assume this is a split system, with the indoor and outdoor unit. If you are talking about the fan on the outdoor unit, this is the condenser fan motor. It is exposed to the heat of the ambient temp. and removing the heat from indoors. If you have a heat pump, this motor runs year around and gets a lot of use. I have seen the 5mfd run capacitor fail which could cause this motor not to start, but more than likely the condenser fan motor has burned out.If it is the outdoor unit you are talking about, can you hear the compressor come on when you start it? You may stand by the unit and have someone turn the t-stat to cool and see if you hear it come on. It will shut off after awhile due to high head pressure. But, if nothing happens, you may not be getting power from the breaker being tripped or a blown fuse at the disconnect box at the unit.Check these before calling out a tech.If you are talking about the indoor fan, make sure the panels are on good if its a gas unit as there is a door switch that is closed and if the panel is loose, it will stop the fan from coming on. The indoor blower motor may also be burned out. It shouldn't take more then an hour at the most to find out what is causing this problem. Could be a fan relay. I would recommend calling a qualified a/c Co. to come out and check this. Wish I was there and could be of more help.
Good Luck, Sincerely, Shastalaker7

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3 Answers

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1 Answer

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In order to accurately determine and diagnose the problem, a more detailed description of the problem needs to be communicated as opposed to normal operation of the system so a repair person can determine that there is in fact a problem. There's a big difference between solving a problem via text as opposed to seeing what is wrong in the field. They rarely are the same.

Goodman condenser sequence of operation on a matched system. Call for cool, condenser starts, 15-30 seconds later blower motor starts, cool satisfied, condenser shuts down, 15-45 seconds later blower motor shuts down. House heats ups and a call for cool via the thermostat starts another cycle.

Based on normal operation it is impossible to determine whats wrong with the information given. There are perhaps 5 voltage measurements in the system that you could be referring to.

Aug 19, 2009 | Goodman Heating & Cooling

1 Answer

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first disconnect the green stat wire wire could be bad if still runs change the board on the indoor unit pull board and take to goodman store with model number and serial number its under warrenty they will give new one hope this helps also look at dip switches and instructions to make sure ok

Jul 08, 2009 | Goodman Heating & Cooling

3 Answers

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Usually short cycling means that High side pressure is getting to high (due to not working condenser fan, or dirty condenser coil), or low side pressure is getting too low (might have low level of freon or restriction in sealed system). low side would drop dramatically if indoor blower is not running, so if air is not circulating thru evaporator coil, coil will freeze up and low side would be much lower then normal. Here is video how I found issue with package AC not coming on. Thermostat call for cool, but condenser would not come on, indoor blower runs ok.

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