Goodman Error Code 1: System Lockout

Severity
Warning
Type
led blink count
Where to look
sight glass
Estimated repair cost: $300 — $650 (parts + labor)
Warning: Your Goodman HVAC system has encountered a system lockout, which requires professional repair.

LED Blink Pattern

LED blinks 1 time.

How to Fix Goodman Code 1

  1. Check your air filter and replace it if it's dirty.
  2. Ensure that your HVAC system is receiving the correct voltage (240V for most Goodman units).
  3. If the issue persists, contact a professional HVAC technician.

How to Reset Goodman Code 1

  1. Turn off the furnace power switch, usually located on or near the unit.
  2. Turn off the circuit breaker for the furnace. Wait 30 seconds.
  3. Restore power at the breaker and flip the furnace switch back on.
  4. Set the thermostat to call for heat. If the error code returns after 2-3 ignition attempts, the fault requires repair.

Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.

What Does Goodman Error Code 1 Mean?

Goodman's error code 1, or system lockout, indicates that your HVAC system has encountered an issue that it can't resolve on its own. This could be due to a variety of reasons, but it's important to note that this error won't cause immediate damage to your system or home. However, it's crucial to address this issue promptly to prevent further complications and ensure your system's longevity.

Common Causes

  • Faulty control board
  • Incorrect wiring
  • Power surges or fluctuations
  • Dirty air filter

Diagnostic Steps

If... Check Expected
HVAC system is not powering on Measure voltage at the control board 24V (for Goodman units)
HVAC system powers on but doesn't run Inspect control board for any visible signs of damage or corrosion No visible damage or corrosion

Applicable Goodman Models

Recall Notices

Goodman/Daikin Evaporator Coil Drain Pans Recalled Due to Fire Hazard 22-014 Active

Issued: November 1, 2021

Affected models: Molded plastic evaporator coil drain pans in up-flow condensing gas furnaces

Drain pans can overheat, melt, and deform, posing a fire hazard. Recall expanded January 2024.

View official notice

Replacement Parts

Part OEM Number Est. Cost Where to Buy
Control Board C220003000 — Find Part

Related Codes on Same Models

Other codes that affect the same Goodman model families as 1.

Code Description Severity
2 Pressure Switch Stuck Closed Warning
3 Pressure Switch Stuck Open Warning
4 Open High Limit Switch Warning
5 Flame Sensed With Gas Valve Off Warning
6 Open Rollout Switch Warning
7 Low Flame Signal Warning
8 Ignitor Error Warning
CONTINUOUS Reversed Polarity Warning
F01 Goodman Code F01 - Ignition Lockout Critical
STEADY-ON Normal Operation Info