Goodman GMS90703BXA Heater - Page 6 - Answered Questions & Fixed issues

Call back who ever fitted it , they is a years guarantee on it .

If pressure switch does not prove fan does not start on some models

it will be in the combustion chamber on the burner bar you will have to remove the burner to get to it .

Hello, you need to run 18 gauge thermostat wire from the Y and C terminals on the control board to each low voltage terminal on the outdoor contactor side terminals. Best way is th run it along the suction line and support it with wire ties. The high voltage wires will run from the disconnect box on the outside to the high voltage terminals on the contactor coil. The high voltage wires will be run in liquid tight conduit.

it's powerd by a relay and only comes on ondemand.

you must see the schematic diagram, and see what amp, and voltage is.If you have doub get customer support from Goodman.comGod bless you

yay

can be a bad fan relay or t stat

You said you checked the fuses and all are working, does that include the fuse in the furnace circuit board? It is a plug style fuse, similiar to the ones used in the auto industry. If this fuse is good, do you have 24 v coming out of the transformer? It says you checked it, but not if it had voltage...Another note is if there is no 24v, check the primary side to ensure that there is voltage coming into the furnace. You may have a loose wire in a junction box, not the most likely scenario, but it does happen. Hope this helps

does it blink 3 times , if so its the pressure switch , or hot surface ignitor is not working or flame sencor needs cleaning , or air filter could be blocked .

One thing all of have to remember is that there is no one fix - for example went to one tonight that had this same problem - when I checked there was no power to the hi limit and if the rollouts trip ypu have to reset them (this tells you there is a problem and get if fixed, the problem here was a bad connection at the molex plug sso code flashes are idot lights to tell you THE AREA of the issue they are not the telltale problem if your hi limit trips it could be a clogged filer with no air flow cut the wire to the hi limit they will still be a 4 flash code and the problem is different

try the furnace without the filter. if it stays running then find out what filter came with the furnace. if you have the owners manual. look for the simple things first. blockage, is the motor and fan runnin properly.. good luck

Hi,

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101

cannot find this code try www.goodmanmfg.com or it could be the flame sensor needs cleaning let me know thanks

Your pressure switch will be located in the burner compartment. You will see the inducer motor that comes on when it has a call for heat. That motor is mounted to the housing inside the furnace. From that housing, there will be a small rubber tube going to the pressure switch. They are usually metal or black plastic, and round in shape. If the pressure switch is malfunctioning, try taking the hose off of the housing, being careful not to damage the hose. Blow and **** in on the hose and listen for the switch to "click" in and out. If there is no sound, it needs to be replaced. Also clear the adapter where the hose connects to the housing with a small piece of wire or something similar. These things clog up all the time and your basically making sure everything is clear before going any further. Another thing that can make a pressure switch act up is the inducer motor not working. And you might check the flue all the way through the roof to make sure its not blocked in any way. Hope this information helps and good luck.

More than likely your gas valve or control board is malfunctioning. You can use a multimeter to check for voltage at the gas valve when the furnace calls for it. In sequence, the IDM will come on, then another click that starts the ignitor which glows, then the next click will be the board sending power to the gas valve. You should have 2 wires on the gas valve, put the meter leads there and when the board calls for the gas valve, you should have 24v at the gas valve. If not, the board is faulty. If you do have the voltage there, the gas valve is faulty and needs replaced. Sometimes you can take a pair of pliers or similar tool and gently knock on top of the gas valve and it will get the valve "unstuck" which can get you some heat if needed. Hope this helps!

The pressure switch is located in the burner compartment. It is round with a rubber tube going from the inducer blower motor housing to the switch itself. When the furnace has a call for heat, the inducer motor will start. At this point, it pulls the pressure switch in, caused by the suction from the housing and rubber tube. If the switch is stuck closed, you then have a code and the heater will not work. One way to check if the switch is operating correctly is to pull the rubber hose from the housing but leave it connected to the switch. Blow and **** in on the hose and see if you can hear the switch opening and closing. It should make a clicking sound. If no clicking sound, the switch is faulty and needs replaced. Also, take a small piece of electrical wire and poke around inside the opening where the hose came off of, sometimes this can get clogged and causes the switch to stick open or closed. You could also have a malfunctioning control board which is more difficult to diagnose. Hope this helps!

the older units have the limit mounted on the heat exchanger straight in front as u look at unit. try taping on unit . newer units are on a circuit board . just for the heck of it unhook the green t-stat wire on termal bloc on unit. if the blower stops then replace t-stat.

need more info....Remove the front panel and look for a sticker that will tell you what the Diagnostic flash codes are...3 . 4 . 5....etc...I service many funaces and cant memorize all the codes..lol...we always need the \manual....What does the furnace do??...Turn the power off (after you observe the code)...then turn it back on with a call for heat....What happens????The exhaust fan starts......then the ignitor starts glowing....etc.////this info is more important than flashing codes

usually on the inside of your furnace door there is a code label and will tell you what each code means... then repost and someone can help you out...