1.Turn power off at on/off switch and main power supply box.

2.Remove rear panel. Refer to: Back Cover

3.Set meter to Ω.

4.Unplug outside fan harness from base unit and fans.

5.Check continuity in fan harness (outside).

6.Unplug inside fan harness from plug on side of electrical box.

7.Check continuity in fan harness (inside). Refer to: Wire Diagrams

Check	Meter Reading	Required Action
Continuity on Fan Harness - outside electrical box	< 1 ohm	Fan Harness OK.
	OL	Replace Fan Harness
Continuity on Fan Harness - inside electrical box	< 1 ohm	Fan Harness OK.
	OL	Replace Fan Harness