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Goodman · Furnace

E0 Lockout - ignition failed 3 times

High severity Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

What the control is telling you

The furnace tried to light three times in one call for heat and gave up. A ComfortNet thermostat shows LOCKOUT E0 and a Call for Service icon. The control resets itself after one hour.

Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Likely causes

  • No gas to the burners or gas supply interrupted
  • Front cover pressure switch stuck open or opening during the run
  • Bad igniter or igniter out of position
  • Wrong orifices
  • Dirty, oxidized or loose flame sensor
  • Lazy flame from wrong gas pressure or a restricted vent / intake pipe
  • Weak inducer

Test and repair steps

  1. Safety gas work by a licensed gas technician only. Shut the gas off before opening any gas fitting.
  2. Reset cut 115 V power, or drop the thermostat below room temp for 1-20 seconds and turn it back up. It also resets on its own after 1 hour.
  3. Confirm gas is on at the meter and the furnace shutoff, and watch a full trial for ignition.
  4. Check the front cover pressure switch hose, wiring and that the contacts actually close.
  5. Check the igniter glows and sits in the right spot. Replace or realign it. Do not touch the element with bare fingers.
  6. Read the flame signal. If the sensor is coated, clean it with emery cloth.
  7. Check the vent and intake pipes for blockage, length, elbow count and termination.
  8. Check inducer performance.
  9. If it locks out again with the same cause still there, it will go straight back to E0.

Settings for these units

Models that show this code

10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

GCVC90704CXGCVC90905DXGCVC91155DXGCVC950714CXGCVC950915DXGMVC950453BXGMVC950704CXGMVC950905CXGMVC950905DXGMVC951155DX

Other codes on the same units

  • C1 Low-stage cooling
  • C2 High-stage cooling
  • d0 No shared data on the control
  • d4 Memory card data rejected
  • E1 Low-stage pressure switch closed at start of heat
  • E2 Low-stage pressure switch will not close
  • E3 High limit or rollout limit open
  • E4 Flame sensed with no call for heat

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Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Troubleshooting Chart p.53-57; Resetting from Lockout p.50. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.