20 Most Recent Goodman GMS90703BXA Heater - Page 6 Questions & Answers

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
• 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
• Locate and correct gas
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
• Verify proper induced
draft blower performance.

Goodman... | Answered on Sep 18, 2013

Ohm out the safety switches also known as the high limits usually at least two on units they look like little buttons, with two wires going to each one. An open high limit will mean the circuit is not closed and allowing for the system to complete the circuitry to fire the heat, best way to diagnose is to jump out the suspected high limit s/w if the unit runs then you have your answer, but never, never leave the high limit switch jumped w/o the switch.

Goodman... | Answered on Aug 20, 2013

Goodman should be able to supply the stack blower or information on where to obtain one

Goodman... | Answered on Aug 01, 2013

The motor may be in need of replacement

Goodman... | Answered on Jul 13, 2013

Hello, The first thing you need to check with a multimeter is if you are getting 24 volts between the R AND C terminal on the intergrated control board. If not than the transformer is blown and needs to replaced or the fuse on the control board has blown and will need to be replaced. When check for 24 volts at the R and C terminal make sure the door switch is pushed in, u can just use electrical tape to temporaily hold the switch in. If you are getting 24 volts at R and C and notthing continues to run than the intergrated control board is most likely the cause and must be replaced.

Goodman... | Answered on Jun 09, 2013

The evaporater fan is likely disabled if the tamper switch on the removable panel is not in place properly (make sure any "service switch" mounted on or near the unit is ON). So, yes - check the switch first. You can remove the panel and depress the switch by hand to see if it comes on. The tamper switch may be line voltage - so be careful poking around on that circuit. If the fan doesn't start - the problem could be power related or a safety switch tied into the low voltage thermostat. All safety switches are in wired series (like the old Christmas light string) if just one detects a problem, the fan will not turn.
You may want to see if the fan works in Heat mode.. that may help identify if it is strictly a cooling related problem or both.

Goodman... | Answered on May 21, 2013

Goodman... | Answered on Apr 25, 2013

It sounds like bad bearings inside the motor, or an off balance blower wheel. When you say circulating blower are you talking about the main blower, or the IDM (smaller motor in the top cabinet)??

Goodman... | Answered on Apr 16, 2013

It is on the data badge on your furnace or in the manuel

Goodman... | Answered on Apr 14, 2013

Is inducer motor running. If not change it. If it is then remove vacuum line from it and blow through the line on start up. If this works change the pressure switch. If not start jumping the sensors around the burner until you find the bad one

Goodman... | Answered on Mar 01, 2013

need to go to furnace and watch it...if your hearing a hum the enducer draft motor may have failed...it should start first if there is no fault codes...reset unit by unplugging furnace or in some cases turning power switch off...turn thermostat on heat and watch unit ..the small enducer draft motor should start first the a ignitor glows and the should light...goodman units have a control board with a light on control board when it fails should flash a code and on the door or inside on lable should give you what that code is...hope this helps good luck

Goodman... | Answered on Feb 21, 2013

Had the same problem; should be the flame sensor, sticks in the flame to monitor temp, take out and clean it or just replace, order on on ebay for ten bucks. Save yourself a 150 bucks to call someone.

Goodman... | Answered on Feb 20, 2013

Sound like your indoor blower motor is bad.

Goodman... | Answered on Feb 03, 2013

Maybe not! there is a limit switch that has opened not allowing power to pass and start the furnace. You will need to tale a Ohm meter and follow the wires thru any safety switch. In your case, it may be the thermo-disc near or over the burner box. Jump it out to test it. Now why is your blower not working (which could have been the reason why the thermo-disc opened)? Once you find which safety switch is open and you have jumped it out, take a jumper wire and jump between the R and G terminals on the circuit board. This should start your fan. If not, either the fan is stuck, the fan motor is bad or hopefully noy; the circuit board is bad.

Goodman... | Answered on Feb 03, 2013


Goodman... | Answered on Jan 22, 2013

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