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GPG13 - Flashing Code 1

Article ID: 700
Last updated: 19 Dec, 2023

Goodman Package Unit: GPG13

Re: Flashing Code 1 / Won't Ignite

Code 1 = 3 Failed Ignition Attempts

► A Manual-Reset Auxiliary Limit and Roll-Out Limit are wired in series with the gas valve and will cause a Fault Code 1.


Qty Possible Causes:
Dirty Flame Sensor
Bad Control Board
Tripped Auxiliary Limit
Tripped Roll-Out Limit
Bad Gas Valve
1 Bad Spark Electrode or Spark Wire


CHECKOUT:

1. Check Ignition Sequence

  • If necessary, reset the furnace lockout by cycling high voltage or low voltage power.
  • Initiate a call for heat from the thermostat and monitor the ignition sequence.

2. Check Control Board Output

  • Re-start the furnace with a call for heat from the thermostat.
  • At the point of ignition, check for 24VAC between Terminal 3 (Purple) of the molex plug on the control board and "Common". 

3. Check Gas Valve 

  • Re-start the furnace with a call for heat from the thermostat.
  • At the point of ignition, check for 24VAC between (PUR) and (BL) at the gas valve.
    • Power at Gas Valve + No Ignition → Step 4. Check Gas Pressure
    • Power at Molex Plug + No Power at Gas Valve ⇒ Check for Tripped Auxiliary Limit or Tripped Roll-Out Limit
      • Tripped Auxiliary Limit = Protection against blower failure
      • Tripped Roll-Out Limit = Protection against a bad heat exchanger

4. Check Gas Pressure 

  • Inlet Gas Pressure
  • Turn off power to the furnace and check the inlet gas pressure.
    • Minimum Pressure = 5" w.c. for Nat. Gas, and 11" w.c. for Propane.
      • No or Low Pressure = Bad Meter or Regulator
      • Normal Pressure ⇒ Continue
  • Re-apply power to the furnace and activate a call for heat.
  • Make sure the inlet gas pressure stays above minimum when the gas valve energizes.
    • Pressure Drops Below Minimum = Bad Meter/Regulator or Restricted Gas Line
    • Normal Pressure ⇒ Check Manifold Gas Pressure
  • Manifold Gas Pressure
  • Activate a call for heat and monitor the manifold gas pressure during an ignition attempt.
    • Normal Pressure = 2.5 - 3.5" w.c. for Nat. Gas, 9 - 11" w.c. for LP
      • No Gas Pressure = Bad Gas Valve
      • Low Gas Pressure ⇒ Increase Manifold Gas Pressure
      • Normal Gas Pressure + No or Delayed Ignition = Clogged Burners  Remove burners and clean spreaders

5. Check the Sparker / Electrode 

  • With No Call for Heat, check the spark electrode wire from the control board to the electrode.
    • Make sure the wire makes good contact at the control board.
    • Look for any rubbed spots that may cause a short.
  • Inspect the spark electrode.
    • Check for damage.
    • Look for any rust particles or other potential shorts.
  • Check the Spark Generator:
    • Remove the spark cable from the control board and attach a good jumper wire to the spark terminal.
    • Turn the gas valve to the "Off" position.
    • Activate a call for heat.
    • Hold the open end of the jumper wire near a grounded piece of metal (be careful to not get shocked).
      • Sparks ⇒ Suspect a Bad Spark Electrode or Spark Wire
      • No Spark = Bad Control Board

6. Check Flame Sensor

  • DO NOT clean the flame sensor before testing!
  • On the multi-meter:
    • Switch the test leads to "COM" and "mA".
    • Set the meter on DC 200ù.
    • Check the reading when the burners ignite.
      • Minimum acceptable reading = 1 MicroAmp
        • Low Reading ⇒ Clean Flame Sensor & Re-check
        • Normal Reading (2 to 6 mA) + Shuts Off ⇒ Suspect a Bad Control Board
    • MOVE SENSOR LEADS BACK TO "COM" and "V" BEFORE PROCEEDING!

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Article ID: 700
Last updated: 19 Dec, 2023
Revision: 7
Views: 128
Comments: 0