Indoor unit displays H1; heating does not start immediately, indoor fan may stop.

Note: H1 on many Senville models is a status code, not a fault.

• Step 1 – Wait for cycle: Allow 5–15 minutes for the unit to complete defrost or preheat. The indoor fan may stop to prevent cold drafts.
• Step 2 – Check outdoor unit: Ensure the outdoor coil is not excessively iced. If it is, clean around the unit and ensure proper drainage.
• Step 3 – Verify airflow: Clean indoor filters and outdoor coil to reduce defrost frequency.
• Step 4 – If H1 never clears: If the unit stays in H1 and never resumes heating, there may be a defrost control or sensor issue requiring professional diagnosis.