Question about Goodman GMS90703BXA Heater

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Goodman gas pack .induction fan comes on but want fire in heat light on circuit board blinks two then off then two

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Could be the pressure switch not working or the hot surface igntior not working

Posted on Oct 15, 2010

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Pressure switch goodman furnace 100-4 blinks three times, installed new switch still wont start.Also does inducer motor start before gas fires??


2nd question first here: Yes, inducer motor (exhaust fan) must run before gas an fire.
MY FOLLOWING ANSWER WAS COPIED OVER FROM YOUR OTHER POST...
I'm going to assume you can operate and understand a VOM, as well as being able to observe the proper safety procedures for performing service work.

In the case of a control board returning an error code for a failing pressure switch, but the pressure switch actually checks out OK, try this:

Test your exhaust fan power leads for power coming in from the board during the first few seconds at the start of the heating cycle. If power is not showing up there, there is likely another circuit malfunctioning somewhere preventing startup. However, if power is showing up there, then deactivate the system and disconnect the exhaust fan power supply leads from the motor. Test the motor's coil for continuity - a failed exhaust motor coil will result in no vacuum for the pressure switch, hence no heating cycle allowed by the control board.


In my case, the exhaust fan actually failed due to a broken coil lead at the binding post to the push-on connector. I was able to repair the coil lead myself - at no cost - hurray!

Oct 20, 2011 | Goodman GMS90703BXA Heater

1 Answer

Goodman gmp0503 unit has status light blinking slowly all the time. The indoor blower wont even come on when you switch from auto to fan on thermastat. The status light says for one blink to check gas...


Take a jumper wire and jump out the R and W terminals on the furnace. The heat should come on. If it does not, you have a bad board. A steady blink indicates no call for heat. You may have either a broken thermostat wire or a bad thermostat if unit fires when you jump it.

Mar 20, 2011 | Goodman Heating & Cooling

1 Answer

I have a downdraft Goodman furnace. On only some occasions the blower will start, then after a few seconds I will see the igniter light up, but then I do not get the rush of gas and lighting of the...


It sounds like you got a tough one there.When you say the blower starts up and then the igniter comes on are you refering to induced draft motor or main blower. The proper sequence is for the thermostat to call for heat at which point the induced draft motor should come on and run for 30-45 seconds,then the igniter should heat up for a few seconds then gas valve should open and main burner should light. After limit switch reaches set point for fan on ,blower should come on till after heat has reached thermostat setting then burner should go out, and blower run until fan off setting is reached on limit switch. If your furnace is not following this sequence and then not always doing the same thing in the same order,I would recommend that you change out board again. I have had several problems similar to this with Goodman units and all but one time installing new board solved it. That time I did everything I knew to do and talked to factory service techs repeatedly and finally installed new furnace. As far as your question about insulation,. As long as it is fire proof I can't see where it would hurt anything. Sorry I'm not more help. Good luck and thanks.

Nov 12, 2010 | Goodman GDS80904BNA Open Flame Heater

1 Answer

Gas will not come on goodman gmnte 120


The exhaust motor starts first andthen closes a small air switch (pressure switch)...if blocked pipe or tube to switch unit will not fire. You can also look at the light on the circuit board for blinks...this will tell you what is wrong. Read bottom blower door for fault codes

May 09, 2010 | Goodman GMS90703BXA Heater

1 Answer

Goodman forced air gas furnace not firing


if your power vent moter is not running you should not have have glowing ignitor.Frist the vent moter must close an air prove switch in series with the idnitor .seems you have a stuck air prove switch.Its the one with a hose attached

Apr 04, 2009 | Heating & Cooling

1 Answer

GOODMAN CMA80905CXBA FURNACE. INDUCTION BLOWER NOT ENERGIZING. GETTING 3 "BLINKS" FROM DIAGNOSTIC LIGHT (LOW PRESSURE SWITCH OPEN). THE A/C WORKS & THE BLOWER FAN COMES ON WHEN THE STAT IS IN...


the pressure switch is closed before the draft motor closes it.the board is telling you that this is not right.pull the wire(either) off of the pressure switch to see if furnace tries to light.if it does,you should replace the pressure switch.

Oct 02, 2008 | Goodman Heating & Cooling

1 Answer

Goodman Furnace m/n GKS90453BKAC


A constant red light (not blinking) indicates that the thermostat is not calling for heat. Of course you know it is but just to be safe, jump out R and W on the board. If it continues to do the same as you indicated, replace the board.

Dec 05, 2007 | Goodman GMS90703BXA Heater

2 Answers

Goodman ac/gas furnace unit mdl. # gmp075-4


i HAD THE SAME PROBLEM, TURNS OUT IT WAS THE FLAME SENSOR, CLEANED IT, AND ALL WAS GOOD

Nov 27, 2007 | Cozy (W352E) Heater

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