Question about Goodman GMS90703BXA Heater

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Goodman heater will not start have continuous blinking light replaced secondary transformer still no work and continusous blinking verified 120 volts to vent fan but vent fan not running vent fan ohms to 18 ohms any suggestions??

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I cant be sure but usually the constant blink on some boards means reversed polarity. Check your HOT (L1 - Black) comming in to the connector box and the your NUTURAL (L3 - White) should not read any volts to ground (not more than 12 volts on an electronic VOM). If this is opposite remove power and reverse black and white wires and retry.
HOPE THIS HELPS PLEASE GRADE ME ACCORDINGLY and GOOD LUCK!

Posted on Mar 03, 2009

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1 Answer

Goodman GMP100-3 igniter will not ignite


Hello, verify if the igniter is receiving a 120 volts from the control board after the pressure switch closes. Sometimes a faulty control board can cause this problem if the igniter and pressure switch are good.

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1 Answer

Furnace problems


On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

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1 Answer

My control board flashes three times, I replaced the pressure switch and made sure there is no blockages, I turned the power off to reset, still it flashes three blinks....help!


Verify if a 120 volts is being sent to the igniter after the pressure switch closes, if you are not receiving 120 to the igniter this could be a faulty control board. If you are receiving 120 then most likely the ignitor is faulty.

Sep 25, 2012 | Goodman Heating & Cooling

1 Answer

I have a goodman furnace with 110 volts going in to the transformer but nothing coming out. Does the transformer need to be replaced?


Hello, yes if you have no voltage on the secondary side of the transformer must be replaced, also, you can turn off power to tje unit and set your meter to read continuity, if no continuity then the transformer must be replaced.

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1 Answer

Hi, My Mother has a stand up goodman in her attic that we are having problems with. The gas valve went out so I replaced it. Then the pre-vent blower went out, so I replaced it. Now it seems that the...


Verify that it has 120 volts present at the inducer motor connections. If it does then replace the motor again. If it does not then you will need to replace the circuit board.

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1 Answer

I NEED A WIRING DIAGRAM FOR A 120/240/24V ACME CONTROL TRANSFORMER.IT HAS H1,H3,H2 AND H4 ON ONE SIDE(PRIMARY). SIDE 2 HAS X2,F1,F2 AND X2 (SECONDARY). IT CAME WITH NO INSTRUCTIONS AND I NEED TO HOOK IT UP...


If you're wiring up 120 volts to the primary then you need to connect H1 and H3 together, then connect H2 and H4 together. Then connect one side of line (120 volts) to H1 and H3 and connect the other side of line (120 volts) to H2 and H4. Then for the 24 volts secondary X1 is one side of your 24 volts and X2 is the other side of your 24 volts.
For 240 volt primary connect H2 and H3 together, Then connect one side of your Primary (240 volts) to H1 and connect the other side of your primary (240 volts to H4. Then your Secondary 24 volts is still X1 and X2.

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1 Answer

I have a goodman gds80703axba. been having issues with it all season so far. it startedout a fault code of 3 blinks. after some investigation dicovered that the control board was bad. now that i have a new...


You probably have had it fixed by now. But, in case not; The ground to the unit must be checked and verified. To check it properly, with multimeter on AC volts and the door switch in, check between the white neutral on the 120v side of the transformer to the secondary common (usually blue, could be grey). This voltage should read below 1 volt. If 2 volts or higher, you have a week ground and that must be found. If good, check between black 120v side of transformer to 24v secondary (red or orange), that reading should be 89-96 vac. This checks for proper polarity across the transformer. If this reading is 145 or so, reverse the black and white on the primary side, recheck for 89-96vac. If both of these are good, remove the wire from the flame sensor, check between this wire and chassis ground with call for heat, you should have 40vac or higher coming out of the board. If not, go to board where FS wire connects and check there. If voltage is lower than 40, it does not have enough for Flame sensor circuit. If it does, check between the Fame sensor and the wire to the sensor with meter set on DC microamps and when flame is present, should read 1-4 microamps. If not, the flame sensor is bad.

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