Question about Goodman GMS90703BXA Heater

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Goodman 2.5 ton heat pump

The contactors will not stay in. unit will run only if i hold contactors in.

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Loss of 24 volt power either from thermostat or transformer. Check for voltage across low voltage side of contactor (the small wires).

Posted on May 16, 2008

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A/C/heater unit at home won't stop running. Have to turn the breaker off to get it to shut off.


Sounds like the contactor is stuck assuming you are talking about the outside unit. You may be able to free it up but it will probably be better to replace it.

Nov 16, 2010 | Heating & Cooling

1 Answer

I have a 1991 model gmn100-4 furnace and air con power supply 115 volts 1ph60hz less than 12 amps my problem is when fan moter kicks in the air unit does not i checked and theres power from breaker box to...


Hi Jimmy, yes, I bet it is hot with that high humidity. From what you are saying, it sounds to me like this pusher switch is the contactor at the out door unit. It has the power lines going into it, and out the other side. It will have contacts on it that you can push down, is this what you are talking about when you say pusher switch? The indoor unit is 115 volts, you are right about that, but the outdoor unit contactor/pusher switch is 230 volts. You should have a box mounted by the outdoor unit for high voltage. Most all of the disconnect boxes have 2- 30 to 35 amp fuses inside them. You may not see them, so pull the plug and the plastic cover in the box to see if you have them. If you do, you may have blown a fuse. Replace both of them. This box is powered by a breaker at your main panel also. You will have a double pole breaker and make sure its not tripped. This contactor has a 24 volt coil on the bottom of it and is energized by the thermostat which closes the contacts to send power through to start the unit. You have to have 230 volts there. Turn the stat on cooling and go out to see if the pusher/contactor switch is energized. If so and the unit is not on, you have no high voltage there to run it, so check for fuses and the main breaker. You have power to the indoor unit, but not the out door unit. Start here and do these checks. Keep me posted on this Jimmy, and get back to me if this does not start the unit or if you trip a breaker. I will be watching for you. We will get it going. If this does the trick, be sure and rate me kindly as I know you will. Keep me updated by my user name below.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor.

Aug 02, 2010 | Goodman Heating & Cooling

1 Answer

Indoor unit freezing up


THE OUTDOOR UNIT HAS A CONTACTOR WITH THE CONTACTS WELDED TOGETHER THE CONTACTOR CONNECTS TO THE COMPRESSOR AS IT TYPICALLY PULLS A SURGE OF 20 -30 AMPS OR MORE..WITH THE INDOOR UNIT IN FAN ONLY THE COMPRESSOR SHOULD NOT BE RUNNING. THE CONTROL WIRES GOING TO THE UNIT HAVE 24 VOLTS TO THE CONTACTOR TO PULL IN THE CONTACTS TO SUPPLY 220 TO COMPRESSOR.

Mar 09, 2010 | Heating & Cooling

1 Answer

No heat at night


You have a poor low voltage connection from the thermostat or a bad contactor.The contactor is the main relay control inside the condensing unit. The incoming voltage wires connect to it.
Contactors are inexpensive. I would change that first.
Check all your low voltage wires in the condensing unit for loose connections.

Dec 11, 2009 | Coleman Heating & Cooling

1 Answer

Have to manually shut off the a/c


Sounds like the contactor is stuck in the points will weld together from the little arc created every time the unit starts. Turn off the circuit breaker to the a-c and check the points in the contactor in the a-c unit.

Aug 20, 2009 | Heating & Cooling

2 Answers

Thermostat wiring diagram for heat and cool unit


out door unit staying on disconnect the yellow wire for compressor if still on contactor bad points whare main line voltage is connected if unit goes off stat bad also check for weedeater damage to stat line at unit hope this helps most systems green fan yellow compressor blue common orange reversing valve white aux heat strip remove stat cover to see how unit is wired up

Jul 03, 2009 | Heating & Cooling

1 Answer

Dayton 3ph 208V heater # 2yu72 not firing off - WHY?


I assume you mean its not Heating by not firing? If its 3 phase you may have lost 2/3's of your heat not just 1/3. Look at the safety's and find if 1 or more are open. Also there is a fuse able link on most elements and if you have had the heater try to run without a blower lately (or anytime in the past) the link may be out. These are usually installed where they "see" the heaters. If you have power to all the elements look for this or a bad element(s).

If your contactor is still not pulling in check for open safety's or bad timer.

Jan 20, 2009 | Dayton Electric Heater

1 Answer

Electric space heater contactor won't stay latched


Jumpered the bimetal thermostat and everything worked smoothly. Tried to clean contacts in thermostat with no luck, so ordered a replacement. At least it was cheaper than the contactor.

Dec 07, 2008 | Fahrenheat Ceiling-Mount Industrial Heater...

1 Answer

A/C Problems


SOUNDS LIKE THERMOSTAT IS NOT SET UP CORRECTLY THE HAVE TO BE PROGRAMED TO YOU UNIT

Aug 28, 2008 | Honeywell Electronic Programmable...

2 Answers

Condensing unit won't start


Safety switch or circuit board.

Jun 01, 2008 | Goodman GMS90703BXA Heater

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