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EasyStart LED Indicator Lights - Solid Lights

EasyStart Flashing Indicator Lights

This document explains fault indication on solid LED indicator models. Models with -UL or -BLUE should see EasyStart Flashing Indicator Lights for diagnostic information.

EasyStart is a device that once installed is a "set it and forget it" kind of device. However, it is always checking to make sure the system is functioning normally to prevent damage and will indicate what it sees through its indicator lights. These are LEDs on the EasyStart circuit board that greatly speed up any troubleshooting, including during installation.

EasyStart models may have clear or opaque lids. Opaque lids will have solid LEDs and the lid must be removed to view them.

There will be three LEDs labelled D21, D22, and D23. Apply power to EasyStart and wait 15 seconds. Note the pattern of solid LEDs and consult the table. Self-Resetting faults will reset automatically and attempt a restart after three minutes. Some faults with the potential to cause damage are not self-reset and require removing power.

If you find that the LEDs are flashing green or red then use our EasyStart Flashing Indicator Lights article.

LED Location: bottom/center inside of the unit where wiring harness enters.
Click image to locate and enlarge:
EasyStart LED indicator lights location

Solid LED indicator Lights Table
Indication D21 D22 D23 Self-Resetting
Normal Operation or No Power       not applicable
Power Interruption or Short-Cycle Timer Active   ON ON applicable
Stall ON ON applicable
Over-Current   ON   applicable
Overload/Klixon Open ON     applicable
Wrong Line Voltage (for -X20 and -T36 120VAC only models) ON ON   NA
Start Winding not Detected/Mis-wiring ON ON ON NA
Unexpected Current     ON NA


  • Normal Operation or No Power: No LEDs means the compressor is running normally or EasyStart does not have power. Use the picture above to ensure you know where to look for the LEDs. Having power means line voltage across EasyStart white and black wires.
  • Power Interruption: Power was lost for several AC line voltage cycles and EasyStart shut down to prevent an overload. It is normal for this to occur with natural power disruptions.
  • Short-Cycle Timer Active: The 3-minute short-cycle prevention timer is active and is normal operation. If the A/C shuts down and wants to start again in under 3 minutes, then EasyStart will prevent starting for the full 3 minutes. This ensures pressure has equalized in the system and a low current start can occur.
  • Stall: EasyStart is not seeing the condition where it can declare that the compressor motor is running at the correct speed. This means that the start failed, or the motor speed reduced enough to stop the motor. There are many possibilities for this fault which can include:
- Voltage collapse of the power source - Failing run capacitor or compressor
- Voltage collapses due to poor wiring - Bad learn data
- Improper wiring - Wrong model EasyStart
  • Over-Current: The current measured by EasyStart has exceeded the maximum amount it allows. Be sure you have the correct model EasyStart for your system. Take a look at our troubleshooting guides at the bottom of the page and contact Micro-Air for further assistance if needed.
  • Overload/Klixon Open: The compressor overload switch has opened during operation and was detected by EasyStart. This indicates poor air or water flow, or a problem with the compressor or the switch itself.
  • Wrong Line Voltage: 120VAC only models. EasyStart (-X20 or -T36) has detected the line voltage exceeds ~150 volts and will not operate.
  • Start Winding Not Detected: One or more of the following wiring problems has occurred:
- The orange wire is not connected to the start winding (compressor "S" wire)
- The black wire is not connected to the common winding (compressor "C" wire)
- L2 is not connected to the run capacitor L2 (capacitor "C" terminal). This may occur if you do not grab the correct compressor "R" wire to connect to EasyStart brown.
- L2 is connected to the start winding (compressor "S" wire)
  • Unexpected Current: EasyStart sees a large current at the beginning of the start process. Verify the wiring, then perform a relearn on the unit and monitor for additional faults. If faults persist after relearning then contact Micro-Air for assistance.

Next Steps: Please use our troubleshooting guides below for additional information, including a troubleshooting workflow and steps to take when met with these faults.
Basic Troubleshooting Guide: EasyStart Trouble Shooting
Advanced Troubleshooting Guide: EasyStart Trouble Shooting