Question about Goodman GMS90703BXA Heater

1 Answer

I have a Goodman furnace GMPN080-4 REV B. I had the blower motor take a dive, so I replaced it with another equivalent 115 VAC 60 Hz 1/2 HP motor. I replaced the 10.0 MFD +10% -5% capacitor with a 7.5 MFD +5%-5% capacitor ( Grainger said it was the capacitor for that motor.) I started the furnace and it ran great for 7 days. Great heat and the blower was operating as it should. Then at the end of the 7th day I noticed the blower motor was running but the house felt like it had dipped in temperature. I checked the furnace and I had my status light blinking 4 times (red). The furnace door indicates: 4 BLINKING RED - OPEN LIMIT SWITCH -- AUX LIMIT OPEN/ MAIN LIMIT OPEN. I don't know what to do next. I do know that when ever the furnace was operating as normal, the exhaust (?) fan motor would engage for about a minute or two, then the ignitor would activate, the gas would flame and then within about another 2-3 minutes the blower motor would kick on and I could then check my registers to confirm heat was being sent throughout the house. Now when I set my thermostat to 78 (house is at 68 now) and turn on my power to the furnace it starts the blower motor- but minus the exhaust blower, ignitor, burners flaming,etc. I don.t know where to begin with the Open Limit Switch,... any help?? Thanks.

Posted by on

  • Anonymous Feb 15, 2009

    I have the same problem where is the switch located, i cant find it

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 96 Answers

Limit switch is on the heat exchanger black plastic about 1and1/2 in. by 2 in. with 2 wires going to it , it has 2 screws holding it in take it out and check it with an ohm meter and you should not have a reading if it is good

Posted on Feb 01, 2009

  • bmxbc Jan 12, 2011

    agreed. Sounds like your high level limit. If your fan quit it would heat up causing your limit switch to go. Would save you cracking your manifold. Going through that very thing now. Replaced the blower fan and still had four lights. Turned power off and unplugged both wires and joined them up. Bypassed it and now works fine. Did it for a test only. Trick is trying to replace with the gas line in the way. Anyone know a way around this?

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

BLOWER NOT KICKININ ON A NORDYNE FURNACE


Do you have 120 volts applied to the motor? Try spinning the blower wheel by hand, if this getsbthe motor running the capacitor must be replaced. If there is power to the motor and does not start up, the motor will have to be replaced.

Dec 12, 2012 | AO Smith Nordyne Furnace Motor 1/8hp 1050...

1 Answer

Old GE Fan Motor


try national energy they are on line as well

Jun 04, 2010 | Goodman GMS90703BXA Heater

2 Answers

Furnace lights fan comes on then fan goes off furnace stays light until overtemp takes it out code flashes 4


Have some one hold the bottom door safety switch, turn furnace on wait until heating fan relay clicks, and check at terminal (Heat) & terminal (neutral or where all the white wires are located on the control board) for 115 volts to 120 volts. If voltage is present replace blower motor, if voltage drops out while running then replace control board.Turn power off to furnace, open bottom door and feel blower motor with hand, if motor is real hot replace motor. you can not oil this type of motor, it has to be replaced along with the compacitor. Good luck.

Jan 22, 2010 | Goodman Furnace Draft Inducer Blower ...

1 Answer

I wish to rewire a single phase electric motor with compositor's that is currently setup for 230 VAC to 115 VAC. The motor is a Ingersoll-Rand Air Compressor motor with the following nomenclacher. Single...


The motor itself should have a sticker which describes the wiring for 115. It is a small change involving a single wire moving from one pole to another inside the motor starter cap (the bump on the motor itself).

Aug 26, 2009 | Air Tools & Compressors

2 Answers

How to install a new blower motor in a Goodman gas


remove the blower unit it slides out on some gas furnaces you may have a control bord in the way if you dont have a goodman motor you will need a belly band to clamp to new motor to provide the mounting arms also after loosening the shaft set screw spray w wd40 turn on side and shake motor should fall out if gas furn 115v motor hope this helps

Jun 09, 2009 | Heating & Cooling

1 Answer

Finding a replacement circulator motor (???)


Replacement looks like it would be a fasco K612... the only difference is the 3000 rpm vs. 3200 rpm.

Apr 09, 2009 | Freezers

2 Answers

Need circuit board for Goodman GMNP-060-3 Rev B Furnace


Go to your nearest HVAC supply house. They should be able to get you it.

Apr 04, 2009 | Goodman GMS90703BXA Heater

6 Answers

Goodman furnace GMPN080-4 Getting 4 RED blinks/Open Limit Swtch


You have a limit switch located in the furnace (a little bigger than a dime and located near the center of the front panel, sometimes the switch is mounted to a small fiberglass board) . There will be two wires going to it. They sometimes trip so often that they fail to automatically reset(due to dirty filters or undersized ductwork). You can SHUT OFF POWER TO THE FURNACE, then remove the two screws holding the switch in the furnace, pull the switch out of the furnace and tap on it and wipe it off.
The switch may work a few more times but should be replaced with the same size and type. You will see some rating printed on the switch somewhere. Write down all the numbers and get a replacemet from a furnace/AC supply house. If you have a meter and know how to use it you could check the switch for continuity.

Sometimes just a tap on the switch will get it going. There will also be a couple of rollout switches that could be tripped. They have little buttons on them to reset them. If they trip it may have other issues to be solved.
Hope this helps!
Matt

Feb 01, 2009 | Goodman GMS90703BXA Heater

1 Answer

Not sure what blower motor to get for my furnace


The real relevant info is 1/2 hp, 1050 rpm, 115 vac, 1/2 inch shaft. Bring that info to any HVAC supply, any appliance parts, Graingers etc. and they should be able to match it up. I just went to the Graingers site and you can order one for $87.50 plus shipping. lease give me a good rating for getting this info for you. Thanks.

Jan 30, 2009 | Ruud UBHC Air Conditioner

1 Answer

Goodman furnace model #GPO 125_4 REV 8 Installed 6/2/2002


Have you measured the temperature in the suppy plenum? Should be 140 to 160 max. If hotter, you have a blockage in the ductwork or vents closed. If within spec, bad circuit board.

Jun 05, 2008 | Goodman GMS90703BXA Heater

Not finding what you are looking for?
Goodman GMS90703BXA Heater Logo

634 people viewed this question

Ask a Question

Usually answered in minutes!

Top Goodman Heating & Cooling Experts

Dan Webster
Dan Webster

Level 3 Expert

8205 Answers

paulcarew

Level 3 Expert

2180 Answers

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

Are you a Goodman Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...