If there is a potential GFI issue, here is a test to try:
- In Fans Only position plug the unit into an outlet or extension cord that bypasses any GFI.
- If unit runs, then switch unit to heater position.
- Leave to run about 1 hour then plug unit into regular wall outlet with GFI.

- If unit runs in non GFI outlet and not Regular GFI outlet, then problem may be with GFI.
- If unit blows fuse in non GFI outlet, then problem may be with unit.

Try this and let us know results.

Additional Question:
Is unit plugged into a surge protect?

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