If your unit has power (power light is ON) but is not operating, follow the steps below.

Quick Checks

• Power cord is securely plugged in
• Power light is ON
• Unit is not in OFF mode
• Unit is set to HEAT or COOL mode
  👉 Click to set your unit to Heat or Cool mode 

If all are correct, continue below.

Step 1: Is the display responsive?

• No (no response when pressing buttons)
  → Continue to Step 2
• Yes (display responds but unit does not run)
  → Go to Step 4

Step 2: Try a power reset

• Turn the unit OFF
• Unplug the unit
• Wait 1–2 minutes
• Plug back in and turn ON

Does the unit respond?

• Yes → Issue resolved
• No → Continue to Step 3

Step 3: Check for control lock or unresponsive panel

• Try pressing multiple buttons (MODE, FAN, TEMP)
• Ensure no buttons are stuck

If still unresponsive:

→ Possible control board or display issue

Step 4: Is a wall thermostat connected?

• Yes
  → The unit may be controlled by the thermostat

  👉 Go to: Switching from Wall Thermostat to Display Control

• No → Continue to Step 5

Step 5: Check Dip Switch Configuration

Incorrect dip switch settings can prevent operation.

👉 View: Dip Switch Guide

Step 6: Check for system protection delay

• The unit may delay startup after power is restored
• Wait a few minutes and observe

Does the unit start?

• Yes → Issue resolved
• No → Continue to Step 7

Step 7: Issue still not resolved?

This may indicate:

• Control board failure
• Internal wiring issue
• Sensor or safety circuit fault

👉 If the issue continues after these checks.

Please contact support: SUBMIT A REQUEST HERE

⚠️ Important Notes

• Power light ON means the unit is receiving power
• Lack of operation usually indicates a control or signal issue
• The unit may not start if it is not receiving the correct command