Question about Goodman GMS90703BXA Heater

1 Answer

No heat i turn the heat on and it gets warm for about three mins. then gets cold again the air is still on but doesnt get warm

Posted by on

  • Danny Clark
    Danny Clark May 11, 2010

    Do you have an LED light on the board? what isthe code?

    cound the blink sequence, look on the diagram for the code.



    It might be a rollout switch problem, or temp limit switch.

    Are the filters clean?

×

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
  • 1,420 Answers

Knowing the sequence of operation on your gas furnace may help you diagnose your condition.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the ignitor does not energize (bad control, bad ignitor), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not lite (dirty pilot), the burner does not lite (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Most newer furnaces will have a diagnostic center or control built into the control module. You may be able to view it as it is running thru a small viewing port. Some models will require the removal of an access panel prior to finding it. On the reverse of the access panel, there will be a diagnostic chart that will aide you in understanding any error code recorded (usually a blinking light).

This is why we technicians earn the big bucks!

Posted on Dec 04, 2008

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

2014 tucson not warming up in cold weather


use diagnostic tool and check if the flaps are operating properly. did you turn off the ac compressor button on the ac panel?

Jan 25, 2016 | 2014 Hyundai Tucson

Tip

Why your unit is freezing up.


To understand why your AC or heat pump is freezing up, it helps to know how your system works.

There are 7 major parts to an AC system, 9 with a heat pump.

1 - Condenser/heat pump (The outdoor unit)
2 - Air Handler (the indoor unit unless the system is a package unit, then all is outside in one system. The air handler is usually found under the home, in an attic, or in a closet.)

In the condenser are the following major parts.

3 - Compressor
4 - Condenser coil
5 - Condenser fan
6 - (HPs only) reversing valve

In the air handler are the following major parts.

7 - Blower motor
8 - Evaporator coil
9 - (HPs only) electric heat strips

Some systems known as "dual fuel systems" use another heat source in place of the heat strips, usually a gas furnace. I will address gas furnaces in another post.

When an air conditioner is operating properly several things are taking place.

1 - The compressor is compressing or "pumping" refrigerant through the system.

2 - through changes in pressure, the refrigerant makes the evaporator coil get very cold, and the condenser coil gets very hot.

3 - The blower motor/fan circulates air across the evaporator coils, as the room temperature air (Also known as "indoor ambient") goes through the cold coil, it exits, cooled approximately 15 to 20 degrees cooler than when it entered. (In a ducted system, the blower is also the fan that circulates the air throughout the home.)

4 - The condenser fan circulates air across the condenser coils. As the outdoor air goes through the condenser coil, it removes heat from the coils that are very hot. This in turn removes heat from the refrigerant so it can run its cycle again, and through pressure changes, cool the evap coil.

5 - With a heat pump, the reversing valve reverses the flow of refrigerant in the condenser and evaporator coils.
In AC mode, the evaporator coils get cold, and the condenser coils get hot. But in heat mode, the evaporator gets very hot, and the condenser very cold.

Now, whichever coil is getting cold will freeze up if there is inadequate air flow across the coil, as the refrigerant in it is far below freezing, and there is not enough airflow to keep the humidity in the air from freezing on the coil.

Things that can cause poor airflow are,

1 - Dirty/clogged coils
2 - dirty/clogged filter (will only effect evaporator coil)
3 - Closed/blocked vents (will only effect evaporator coil)
4 - Malfunctioning or dirty fan

Low refrigerant will also cause a coil to freeze up, reduce efficiency and cause the system to run for long periods of time. Not to mention, shortening the life of the unit.

With a heat pump, in heat mode only, the condenser (outdoor) coil will routinely begin to freeze up in cold temperatures. This is due to the fact that the refrigerant is below freezing, and the cold outdoor ambient temp is not warm enough to keep the condensation in the air from freezing on the coil.

Note, a properly working AC should never freeze up.

A heat pump is equipped with defrost controls to prevent ice buildup.
Some are controlled by timers, some by temp.

When a HP is going into defrost mode, the condenser fan shuts down, the reversing valve reverses the flow of refrigerant and the once cold condenser coil now gets very hot, defrosting the coil. (Many people have said this process sounds like the unit is coming apart, or about to explode and are frightened by the "smoke" which is really just steam from melting ice that comes off the unit.)

During defrost mode, the secondary or "auxiliary" heat comes on to ensure that you are still getting warm air from the vents. (Again, this can be electric heat strips or a dual fuel system)

If you are experiencing cold air from the vents during defrost, that means your auxiliary heat is malfunctioning.

The auxiliary heat is used for three purposes.

1 - during defrost mode to maintain warm airflow (automatic)
2 - when the HP cannot maintain the set temp due to extreme outdoor temps. It comes on when the indoor temp drops several degrees below the set temp on the thermostat (automatic)
3 - For emergency heat source when the HP is not working. (Manual)

To recap....

Iced up coils?

Poor airflow
low refrigerant
Malfunctioning fan
failing defrost system


There are two things that can be done in a pinch to help de-ice frozen coils. This may get you by until the repairman can get there, or you can fix the system if you are a do-it-yourselfer.

HPs frozen outdoor coil in heat mode, not going into defrost?

Cover most of the vents, and turn the system onto cooling mode until the outdoor coil is thawed. then uncover vents and return to heat, or emergency heat. (this usually takes 15 min or less)

Frozen coils in AC mode with a heat pump?
Turn the system to heat with the thermostat on just high enough to get the system to come on. (again, usually takes 15 min or less to thaw.)

AC only, with frozen evap coils? (this can sometimes be seen frozen all the way outside to the compressor on the copper lines.)

Turn the system off, and the fan switch from "auto" to on".
This will usually defrost the coils within 1 to 2 hours.
(If your system has the furnace in line before the evap coil, turn the system to heat, and the furnace will defrost the coil within minutes.)



on Dec 25, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

My 2000 expedition will not start just clicks under dash but doesnt always first time it happened suddenly came home from store turned motor off got back in 10 mins later just clicked sat for a day or two...


This is a classic sign of a bad starter. When a starter is on its way out, it will usually start when cold. Once it heats up after a short trip or 2, it takes more and more power to get the starter to turn. If the truck will start with a jump when warm, you've confirmed that you have a bad starter.

Apr 27, 2011 | 2000 Ford Expedition

1 Answer

My Air Conditioner does not get cold after I turned it off and turned it back on. I have now turned the themostat off about 20 mins ago


Air conditioners need a few mins to stabilize (the fluid in the lines) after they are shut off in the middle of operation. The comperssor will normally time out for several mins after it shuts off (or you shut it ofF) preventing it from coming back on within that time. So if you turn it off, and then right back on, you can expect warm air for several mins untill it times out.

Jun 17, 2009 | Honeywell Electronic Programmable...

1 Answer

No heat for my truck


You have a problem with the temperature control blend door actuator in the air ducting system, this part can't be replaced without removing the dash assembly.

Dec 16, 2008 | 2003 Jeep Liberty

2 Answers

Intertherm heat pump blows hot then cold then hot


You may have a problem with a temperature safety system.  Before changing anything else, check to see if the unit is clean!!!  Dirt/dust can fool the safety system into an overtemperature status.  Inspect the heat coils for damage and dirt.  Gently clean.  

Nov 23, 2008 | Intertherm P3RA-048K Air Conditioner

1 Answer

I have a Rinnai Energysaver 556F


The heater will have some error codes stored in it. To retrieve them get an assistant to write down the codes as you see them. They come quickly. OK to get the codes, push down on the Economy button and the up arrow and down arrow at the same time. Hold for three seconds. It will take three fingers to do this. Once you get the error codes, look in your owners manual to diagnose.

Nov 21, 2008 | Rinnai RHFE-556WTA Direct Vent Heater NG...

1 Answer

If I start my truck and turn the A/C on it works, but once I start driving it goes to hot air.


I see two possibilities to check first.

Check if your belt is loose. Usually there should be around 1/2 inch of give or play on the longest area of belt between two pulleys. If the belt is loose, then when you accelerate, the belt slips past the AC pulley, and can not turn the compressor.

Next, it is possible that the blend door, which allows heat from the heater core into the mix of cold/warm air is not working right. It could be stuck open so that you have warm air mixing in with the cold air. As the engine gets warm, that heat transfers in through the blend door.

If you start your vehicle, and let it sit for 15-20 mins, will the cold air go to hot air also? If so, then this could be the problem.

Let me know how you progress!

Brian

Jul 14, 2008 | Mazda B2300 Cars & Trucks

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

140 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

2404 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...