Step 1: Is the fan running?

• Yes → Continue to Step 2
• No (no airflow at all)
  Go to: Fan Not Running or No Airflow

Step 2: Did the unit just start?

• Yes
  → This is normal. The unit may delay the fan to prevent blowing cold air.
• No → Continue to Step 3

Step 3: Is the outdoor temperature very low?

• Yes
  → Heat pump performance may be reduced in cold weather
  → The unit should switch to electric backup heat
  → Continue to Step 4 
• No → Continue to Step 4

Step 4: Is the air warm or cold?

• Warm air
  → Heating is working, but performance may be limited
• Cold or cool air only
  → Backup heat may not be activating
  → Continue to Step 5

Step 5: Could the unit be in defrost mode?

• Warm air
  → Heating is working, but performance may be limited 
• Cold or cool air only
  → Backup heat may not be activating
  → Continue to Step 6

Step 6: Is a wall thermostat connected?

• Yes
  → The thermostat may not be sending the correct signal
  Go to: Switching from Wall Thermostat to Display Control
• No → Continue to Step 7

Step 7: Check Dip Switch Configuration

Incorrect dip switch settings can disable or affect heating.

View: Dip Switch Guide
Ensure heating-related switches are correctly configured

Issue still not resolved?

Please contact support for further assistance - SUBMIT A REQUEST HERE