Question about Goodman GMS90703BXA Heater

1 Answer

Fan will not work in "auto" for heat request. fan works fine in "on". digital display on thermostat goes out during heat "auto" request. 24v transformer was weak, so replaced that. now, still same problem, but the thermostat display does not go off anymore. furnace is a 1964 Crane with limit switched thermo-mechanical cam, single speed fan motor, relay, 24vac transformer and burner ignition. replaced the relay in the middle of the summer, when it stopped working on a very very hot day, but did not test heating at that time. So, it could be related? that's pretty much it...

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,600 Answers

What brand of thermsotat do you have, if it's working on auto and not calling on heat then the thermostate is most likey bad the metal plate on the inside may be wore down, you may be able to pry it up to make it work but it you ggive me the thermostate brand I can give you exact details hot to fix.

Posted on Oct 09, 2009

Ad

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

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have a ComfortMaker SoftSound 1000+ model CAC036akc4. Is this a heat pump model. I'm trying to install a nest thermostat and can't get it to work.


The model number you provided is for a 3 ton a/c only. Not a heat pump.

If you are installing a digital thermostat, the problem may be in the configuration menu. It will have to be told what system you are asking it to control....1 stage heat and 1 stage cool would be the standard residential hvac system.

Make sure there is a jumper between the terminals Rc and Rh to make sure both heating and cooling cycles will work. There should be a dip switch on the sub base to select either electric heat or gas heat. Verify all your wiring connections are correct. Thermostat connections: Rh terminal is 24v power for the heat cycle. Rc is the 24v power for the cool cycle. W terminal is the heat connection. G terminal is the fan control connection. Y1 is the a/c connection. If you have a "C" connection, that is the 24v common connection that should be connected to the control transformers common connection in the furnace.

Dec 29, 2014 | Heating & Cooling

1 Answer

Honeywell Thermostat RTH6350 makes heat run in AC mode after AC runs


Well, if it wasn't doing that before then you more than likely know its in your wiring. Cools down then heats back up sounds like the auto change over is on, and the heat setting is higher than the cool setting?

Mar 02, 2017 | Heating & Cooling

1 Answer

Heat won't come on. My hvac system worked fine throughout the summer but now that it's getting cool the heat won't come on. I have a Hunter digital, programable thermostat. I reset and...


if you have an electrical meter this is how to test for bad t-stat heating relay. (this is for the most typical furnace setup in a typical home)
first you will need to find and do several things at the furnace.
find the MAIN furnace switch and turn off. switch should be mounted outside of furnace on either side of furnace cabinet. remove both furnace doors. find the electrical circuit board, it will be the square thing that almost all wires go to or come from. find the 24v (t-stat) connection screws on the circuit board. they should a row of small phillips screws, and there should be a minimum of 5 screws in a row. the screws will be labeled as follows (not in certain order) R W Y G C . The screws you will be concerned with are R, W, and C. If there is not a C screw you will substitute the C screw for a unpainted part of the furnace cabinet in your testing. The last thing to find is the door switch which should be mounted behind the lower door. It is mounted so when the door is attached the switch is depressed. Use some tape or something to depress the switch without the door on. you will not have enough hand to do it manually during testing. get your electrical meter and your ready to test. always remember that if the Main furnace switch is turned on any of the electrical connections, motors, etc. inside the furnace could be energized at any time.

step 1 : with main furnace switch on, both furnace doors removed, and door switch depressed go to your thermostat and turn a minimum of 5 degrees higher than ambient. if t-stat isnt on then something you did is wrong. check switches.

2: with newer t-stats there can be a delay. so wait 5 minutes then go to furnace.

3: put electrical meter in AC and in correct range if you have a cheapo meter. you will be reading 24v so correct range is the closest to 24v but must be above 24v. take your leads and put one on circuit board screw labeled R, other lead on C. you should read 24v or similar. minimum voltage should be about 22v. anything less than 20v there is a problem far before your thermostat. if you read 24v move on.

4: take your leads and put them on the W screw (heat) and C screw (common24v). You also should read 24v. If you get a reading less than 20v or no reading at all then you either have a bad thermostat or bad thermostat wire.

Oct 23, 2011 | Hunter Fan Company 5/1/1 Programmable...

2 Answers

How to wire contactor on Sears ac condenser style 36LC-000087CR


The contactor for the compressor and outdoor fan is activated by your thermostat when you call for cool. The small coil is an electromagnet that gets 24VAC when you call for cool at the t stat. The red wire in your T stat connects to the blue (or sometimes yellow wire) in the t stat completing the 24VAC circuit and closing the contactor. The line voltage is supplied to the poutdoor fan and compressor upon the contactor closing.

You can manually pushthe contactor close and the outdoor fan and compressor should start. Do this with your hand on the insulated portion of a screwdriver and take the tip of the screwdriver and push the contactor closed. The compressor and outdoor fan should start. That tells you that you have a thermostat to contactor coil issue if the t stat does not close the contactor when you call for cool.

Aug 03, 2011 | Heating & Cooling

2 Answers

My air handler fan will not come on during heating but will operate during cooling - Anerican Standard unit TWEO65E13FBO


Hi,
Please check the thermostta first. Take the thermostat to the air handler and hook up on a short thermostat leash. The unit should work properly, then its for sure that the problem is going to be in your thermostat wiring. If problem persists then we are troubleshooting a thermostat.

Let us know if you need further assistance.
Thanks for contacting Fixya.com

Jan 12, 2010 | Heating & Cooling

1 Answer

AC, Fan-Auto, Fan-On... nothing works. the request from the Thermostat doesn't engage anything. Thermostat Dispay works. How do I know if it is getting the 24volts from the relay? I presume the display...


Open the air handler. Locate the low voltage transformer. One side is 220 volts input. The other is 24 volts output. Take your VOM and touch the test leads to the input to verify 220v in. Then touch the other 2 leads to verify 24v out.
If you have power in and no power out, replace the lv transformer.

Jul 08, 2009 | Honeywell Heating & Cooling

2 Answers

Fan will come on for heat(auto), but not for AC or set to ON


You have a blower relay in the furnace that's probably bad. In the heat mode the blower is on a temperature relay, in cooling mode the blower has to come on immediately so there is another relay for cooling. The green wire on the thermostat feeds that relay, so if you go to the furnace and shut the power off and find the green wire from the thermostat that feeds that relay and replace it, being careful to mark all the wires before removing them, also the relay terminals have numbers for identification.

Apr 07, 2009 | Heating & Cooling

2 Answers

Robertshaw 9600: Temperature rises too high, fan doesn't stop.


It sounds like the thermostat is wired improperly. One quick was to check is by finding breaker to unit and shutting off power. Go to thermostat and remove from wall take all wires off thermostat besides wire going to R(might be RcandRh) and C(which is common) Tape all bare wires removed with electrical tape. Now go back to the breaker and turn power back on. Nothing should be running at all. Take a voltage meter and measure the voltage from R to W(which is heating). If you read 24V then the thermostat is open and not calling for heat. Now turn the thermostat up so it is calling for heat. You should read 0V from R to W. If this checks out your thermostat is probally fine. You can check the fan the same way by going from R to G. In auto you shoul read 24V from R to G and in th on postion you will read 0V from R to G. If the thermostat checks out then the problem is probably at the furnace or rooftop. Either with the thermostat wiring or the main board acting up

Jan 19, 2009 | Heating & Cooling

1 Answer

Auto fan does not turn my furnace fan on-I have to use manual on


with the fan in the auto position, the fan only comes on during a demand for heat.  does it not come on during a demand for heat?

Nov 24, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

My digital thermostat has shut off after a power failure. There is absolutley no display appearing. I pulled the thermostat off thinking maybe the batteries were no longer working but came to find out that...


What you have is a 24v control circuit problem. There is a transformer in the air handler ( inside unit ) you will have 220v on the one side and 24v on the other. If you have 24v from transform there is a small fuse on the pc board that could blow during power problems. On the inside cover you should find a wiring diagram.

Oct 01, 2008 | Carrier 38CKC042 Air Conditioner

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

85 people viewed this question

Ask a Question

Usually answered in minutes!

Top Goodman Heating & Cooling Experts

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Paul Carew

Level 3 Expert

2557 Answers

Tim Whalen

Level 3 Expert

3074 Answers

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

Answer questions

Manuals & User Guides

Loading...