Question about Goodman GMS90703BXA Heater

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Heat Starter motor constantly running when ac is on

I have a goodman 125-4 and the heater starter motor never shuts off when AC is on. for now, i have it disconnected. Any idea what is problem?

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By saying the heater starter motor I guess your taking about the combustion blower( the small motor that vents to chimney) If it runs during the A/C cycle then the main circuit board is bad.

Posted on Sep 13, 2008


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The dna 125 wont start

Hi and welcome to FixYa,

Initially, is there an alarm/immobilizer? If yes is it active/enabled?

Offhand, by "...wont start..." do you mean starter motor will not spin or engine turns but will not fire?

Starter motor will not turn:
  • press start button, check for +12 on green/black wire from starter switch to starter relay;
  • if there is, is there a clicking sound?
  • if there is a clicking sound, short temporarily the 2 big terminals of the starter relay;
  • if starter motor turns, starter relay faulty;
  • if not, starter motor needs looking into particularly the carbon brushes and the commutator segments.

Starter motor turns but no spark:
  • check/replace sparkplug;
  • check pulsating voltage on green/white wire going to ignition coil coming from the ignition control unit;
  • check pulsating low AC voltage on green wire going to ignition control unit coming from the pulse generator coil;
  • check presence of IGN +12 leading to the ignition control unit.

Starter motor turns, there is spark but motor will not run:
  • check automatic choke (blue & white/black wires);
  • check fuel quality and quantity delivered to combustion chamber (check sparkplug if wet).

Good luck and thank you for asking FixYa.

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A blower relay usually has a set of closed contacts that go to the  motor and when the 1st element comes on the power goes on through the sequencer and then these contacts and to the motor heating speed. If you have a blower in AC and with the fan sw to ON u can run the blower on manual 100% of the time until someone can come look at it and the heater coils will cycle on and off with the thermostat. Dont worry about the cost compaird to the elements the motor is nothing and the heat it generates is going into the heated home anyway. 

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