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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Posted on Jan 02, 2017

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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

Jan 23, 2008 | Goodman GMS90703BXA Heater

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I have a new heater with diferant terminals from the old one so not sure how to atach the wires


There is no need to rewire the internal of the heater!
Just bring in the electrical supply to the heater, it can be either 120 or 240 volts.
If the heater you have is like the picture associated with your post, then all then have to do is change the supplied plug from 240 to 120. It comes pre set for 240. That plug is inside the cabinet.

If any other brand, then you need to change the wires at the transformer of the heater. All heaters need to be supplied with primary voltage: 120 or 240. Then the control system is supplied with secondary voltage out of the transformer. The secondary voltage is no more than 28 volts. and these wires are normally colored as blue or yellow.

Secondary power is already wired within the heater. NO need to change where they are. You will only need to deal with the Primary wiring.

There are many varieties of transformers that transform high primary voltage to a low secondary voltage of 28 volts. and these transformers have many wires: primary & secondary.
I will try to make this easy to understand.

If you have a Gas Heater Transformer with these colors:
  • Red
  • Black
  • White
  • Green
Or...
  • Red
  • White with Red Stripe
  • Black
  • White with Black Stripe
  • Green
These are Dual Voltage Transformers, you can bring in either 120 Volts or 240 Volts

If you bring in only 120 Volts...
1st example:
The Red wire will not be used! Hot wire to the Black, and the Neutral/Common, to the white wire. Green to ground.

2nd example:
Connect the Red wire with the White with Red Stripe together and connect these to the incoming Neutral/Common wire, normally White.
Connect the Black Wire with the White with Black Stripe to your incoming Hot Wire, which is normally Black.
Green to ground

If you bring in 240 Volts...
1st example.
1 Hot wire to the Red, the Other Hot wire to the Black, and White wire is not used. Green to ground

2nd Example:
Wire nut the two Striped wires together. then one incoming Hot wire to the Black, the other incoming Hot wire to Red.
Green to ground

Or This is only a Low voltage - 120 Volts Only
  • Black
  • White
  • Green
Or either any of these combinations...
  • 2 Blacks w/Green
  • 2 Reds w/Green
  • 1 Black, 1 Red w/green
This type will only be a high voltage, 240 volts only
Picture below is what a transformer looks like and it is where your incoming supply wires go. The smaller leads with the spade connections will go to a specific location & is the 'Secondary" .

Good Luck



25568369-di2jpn2pb5nzkrgf0hzbmyq5-3-0.jpg

Mar 14, 2015 | Pool & Spa

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.

Oct 13, 2012 | Goodman GMS90703BXA Heater

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.

Jun 19, 2011 | Goodman Heating & Cooling

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.

May 08, 2010 | Heating & Cooling

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.

Dec 10, 2009 | Goodman GDS81155CNA Open Flame Mid-Size...

1 Answer

Fried transformer in air handler above board no #'s or voltage specs


What you need is a 24 volt transformer that has a rating of at least 40VA. 120 volts is the primary and 24 volts is the secondary voltage. You should try to figure out why the transformer burnt out first.

Paolo

May 05, 2009 | Heating & Cooling

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