GL1RC - Flashing Code 2

Nordyne Gas Furnace: GL1RC

Re: Flashing Code 2

If, after the vent blower is energized, the pressure switch does not close, the control will keep the blower on and wait for the switch to close. The diagnostic code for this problem is 2 short red flashes followed by a pause.

► The diagnostic code will go away once the pressure switch closes.

CHECKOUT:

1. Check Control Board

• Start the furnace with a call for heat.
  • The Inducer motor should start within 15 seconds.
    • Inducer motor does not attempt to start & shows Code 2 ⇒ Check for 115V power to inducer.
      • Power Present + No Inducer → Step 2. Check Inducer Motor
      • No Power = Bad Control Board
    • Inducer motor starts and runs normally → Step 3. Check Pressure Switches

2. Check Inducer Motor

• Start the furnace with a call for heat.
• Observe and listen to the inducer motor.
  • Inducer motor hums but does not start:
    • Bad Inducer Motor or Capacitor
    • Item in Inducer (Remove inducer & check)
  • Sound of water "slurshing" = Water in Inducer
    • Remove Inducer, pour out water, re-install inducer → Step 4.  Check Condensate Drainage
• Ensure that the pressure switches close.
  • Pressure switch fails to close → Step 3.  Check Pressure Switches
• Listen for sounds of water in the vent piping.
  • If water is gurgling in the vent, look for low spots that will hold water.
    • The vent piping must have a constant slope back toward the furnace.

3. Check Pressure Switches

• Make sure there are no sags in the pressure switch hoses that could hold water.
• With the furnace running, use a pressure meter to check the pressure at both switches.
  • Check for water in the pressure switch hoses.
    • Water in the hose is usually the result of a mis-run or sagging hose.
    • Make sure hoses are properly sloped so not to hold water.
• Compare actual pressure to the pressure rating on the switch.
  • Pressure well above the rating, switch should be closed.
    • Switch does not close = Bad Switch or Water in Switch
  • Pressure near or below rating = Blocked or Restricted Vent

4. Check Condensate Drainage

• Remove the drain hoses.
  • Water running out of furnace = Clogged Drainage
• In extreme cold conditions be cautious of Frozen Drains.