H3 displayed; unit may shut down compressor while fan continues to run.

Safety first: Unplug the unit. Components in the compressor compartment can be extremely hot.

Steps to address H3:

• 1. Improve ventilation: Ensure the rear of the unit (or exhaust duct on portable models) is not obstructed. Move furniture or curtains away from vents.
• 2. Clean condenser coil: Remove the outer shell and clean the condenser fins thoroughly with a soft brush or vacuum.
• 3. Check condenser fan: Verify that the outdoor fan runs whenever the compressor is on. Replace the fan motor if it fails to start or is noisy and slow.
• 4. Inspect run capacitor: A weak capacitor can cause the compressor to overheat. Replace with the correct Insignia-specified capacitor if bulged or out of spec (advanced test).
• 5. Allow cool-down: Let the unit sit unplugged for at least 30 minutes to allow the compressor overload to reset, then test again.
• 6. Professional service: If H3 recurs quickly after cleaning and fan repair, the compressor may be failing internally and should be evaluated by a professional.