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Diagnosing Velit AC Not Blowing Cold

How to determine if an AC unit is repairable with parts or if it needs replacement

Below is a flowchart used to determine why a Velit AC unit may not be producing cooled air.  Below the flowchart each step is broken down with instructions. Disclaimer: This flowchart should only be used as basic diagnostic guidance only.

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Video: AC Not Blowing Cold


Additional Instructions for Each Step:

Step 1: Set the system

Set the unit to Turbo Mode and adjust the temperature to the lowest setting.

Step 2: Check the ambient temperature.

  • Is it at least 67°F (20°C)?

If NO:

  • Try again on a warmer day. The unit may enter anti-frost protection at low temperatures.

If YES:

  • Continue to the next step.

Step 3: Power

Check the power consumption.

  • Does the unit draw more than 100 watts?

If YES:

  • The compressor is running.
  • Likely causes: refrigerant leak or internal blockage.
  • Action: Replace the unit.

If NO:

  • The compressor is not running.
  • Likely causes: electrical components or wiring issue — generally easier to fix and should take 5–30 minutes.
  • Action: Proceed to the next step.

Step 4: Outside fan

Is the outside fan running?

  • The outside fan is controlled by the DC controller.

If YES:

  • The controller receives signals from the display panel.
  • Likely issue: DC control problem.
  • Action: Replace the controller.

If NO:

  • Check the display panel that sends the control signal.
  • Action: Continue troubleshooting.

Step 5: Display Panel Connectors

  1. Pop the display panel off and reseat the 4-pin connector.
  2. Check if the system draws more than 150W.
  3. Measure voltage between the black and green wires using a multimeter:
    1. Should read above 5V.

If the voltage is below 5V or the customer cannot get a reading:

  • Action: Replace the display panel.
  • Note: If the customer canThe issue may not actually be the display panel, but this is the first step to isolate the problem.

Step 6: Measure

Measure voltage at the display connector.

  • Does pin 3 to pin 2 read 5V?

If NO:

  • Action: Replace the display panel.

If YES:

  • Continue to the next step.

 

See the image below, you want to measure voltage between pins 2 and 3 as shown at bottom of chart. 

Step 7: Reseat and tighten

  • Reseat the 12-pin connector on the controller. Check that all wire connections on the DC Controller and Compressor are tight. Retest Unit. If this still does not work, replace the DC Controller.