Step 1: Is the fan running?
- Yes → Continue to Step 2
- No → Go to: Fan / No Airflow Issue
Step 2: Is any heat coming out at all?
-
Yes (slightly warm)
→ Unit may be underperforming
→ Continue to Step 3 -
No (completely cold air)
→ Continue to Step 3
Step 3: Is a wall thermostat connected?
-
Yes
→ The unit may not be receiving a proper heating signal
Go to: Thermostat Troubleshooting Guide - No → Continue to Step 4
Step 4: Check Dip Switch Configuration
Incorrect dip switch settings can disable or affect heating.
Ensure:
- Heating is enabled
- Correct control mode is selected
Go to: Dip Switch Guide
Step 5: Restart the Unit
- Turn the unit OFF
- Wait 1–2 minutes
- Turn it back ON in HEAT mode
Check if heating starts
Issue still not resolved?
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