Question about Goodman GMS90703BXA Heater

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

Going out on high temp. This is a list of things all ready checked
check list
1- Blower running right direction
2-A-Coil clean
3-Replaced high temp switch
4-Replaced gas valve
5-Heat exchanger no rings pop lose
6-Heat exchanger looks good from top side,Removed blower

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  • charo2 Jun 11, 2008

    Check temp. at high limit switch ,230 in 4 min.

    vents open

    intake open ,removed filters

    Question;What does goodman use to seal the ends of the

    heat exchanger at the transducer motor

  • charo2 Jun 12, 2008

    1st. let me THANK you for your help.

    I thank it could be the burner flame

    Gas pressure to high from gas co.or

    wrong orifice for altitude.

    I will take burners apart an check them

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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.

Posted on Jun 10, 2008

  • Chandler Ede
    Chandler Ede Jun 11, 2008

    Typically if you are refering to the inducer motor, nothing. Are your exhaust temps real high? More than 200 degrees? Is the board flashing any lights? Try this link for a troubleshooting guide. http://www.dnmech.com/furnace_info_older...

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1 Answer

No heat from furnace, Goodman GMPN080-4 Rev A. Cycle is solid red status light, then 3 flashes indicating open pressure switch because the inducer fan does not come on.


Jimbo, it sounds like you are aware of the operational sequence to suggest using a voltmeter to check the actual wires going TO the combustion air fan...if there is no voltage from the board, the board is bad. Just make sure one of the high temp limits are not open... one may be in the blower compartment on some and one will be near the top of the vestibule and a roll out switch should be near the burners. They should all be wired in series.

Always check the manual reset safty switches as the first step in troubleshooting.

Nov 21, 2015 | Goodman Heaters

1 Answer

After one heat cycle, the blower motor keeps running, even after cool down is complete. The furnace will not refire until i turn off the power and wait about 20 minutes for a reset.


your limit switch is opening up, that causes constant fan. Check for flashing codes after flame shuts off and fan continues. Check airflow, filters, lack on return air for possible hi temp limit problems.

Nov 17, 2011 | Goodman Heaters

1 Answer

Have a gmp125-4 furance blower runs all the time checked themostat wires error code 1 blink then 2 then 3 then 5 furance works if you turn power off turn back on when heat kickes off blower comes on gives...


Sounds like limit switch issue. Furnace heats up, high temp limit switch opens, fan will stay on. GMP model is older and do not have the codes.
May be over fired, have airflow problem, to cause the limit to open.
Next time before shutting off power, try to find the limit, it has two wires that connect to a 1.5 x 2 inch card mount to the furnace fire wall. tap on it and see if the blower stops. If so replace the limit.

Sep 06, 2011 | Goodman Heaters

2 Answers

To much air flow..3ton blower..can i slow this down..i know its adjustable..ii hope down..what speed do they come from the factory


Should be able to slow down. Inside bottom door of furnace there are 4 or 5 wires, connected to board and blower motor. White is common. Red is slowest, then orange, blue, black fastest.
1 of these wires should be connected to Air Cond tap, one to furnace tap and 2 to unused taps.
If you are currently running furnace, connect red wire to heat tap. Make sure unit does not get to hot. Should be able to hold hand on Metal duct above furnace without getting to hot. Temp coming out of furnace should be around 35 to 60 degrees higher than temp coming into furnace. Actual heat rise temp is listed inside top of furnace rating tag.

Jan 17, 2011 | Goodman GMS90703BXA Heater

1 Answer

I have a goodman 125-5 rev A furnace and it is showing a three blink error. what is this and can it be easily fixed or do i need to call a furnace tech. to look at it ?


FAN COVER SHOULD HAVE CODE LISTINGS .LOOK AT BOTH COVERS INSIDE AND OUT.  MANY CODES ARE PRINTED SOMEWHERE ON UNIT OR MANUAL. IF YOU TELL ME WHAT IT IS DOING OR NOT DOING I CAN HELP

Apr 19, 2010 | Goodman Heaters

1 Answer

Goodman furnace GSM100-4 model has constant ligt blinking. Will fire all burners and in few seconds shut off. Help


for what ever reason, your shutting down on high temp
4 things to check
1 the filter
2. your fan, is it comming on....... to circulate the heat.
3. your hi temp thermostat is bad and needs to be replaced.... it should be a sqaure with two wires
you can just ohm it out to know sometimes orange but it differs some
4. above your fan are the coils, ar5e they clean and free of restriction

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1 Answer

Goodman furnace


double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again

Jun 02, 2009 | Goodman GMS90703BXA Heater

1 Answer

Goodman Model GMNT100-4 Auto Power Down and Up until Temp.


Keep in mind all furnaces and circuit boards are not the same. Look on the back of the door to the blower compartment. You should find the list of diagnostic codes. Look up four blinks it should narrow down the problem. Although from the discription you gave it sounds lie the high limit control. When a high limit appears to be acting up it DOES NOT mean that the high limit needs replaced. The high limit just may be doing its job. This means that the furnace is overheating. Check your filters. Are all of your registers open? Is your blower set on the right speed? Is your blower going bad? Is the blower motor capacitor bad? Is your evaporator coil restricted? Just changing a high limit switch does not always solve the original problem!
Good luck....

Apr 01, 2009 | Goodman Heaters

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...


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

Feb 01, 2009 | Goodman GMS90703BXA Heater

2 Answers

Furnace won't stay running


1
1 FLASH
Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
sensor.
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
performance.
• Locate and correct gas
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
igniter.
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
• Verify proper induced
draft blower performance.

Nov 23, 2008 | Goodman GMS90703BXA Heater

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