Display shows H1, unit may run fan only or delay heating

Safety: No immediate repair is usually required; this is often a normal protection mode.

Steps:

• Wait for cycle: H1 typically indicates the unit is in defrost or is preventing cold air blow. Allow 5–15 minutes for the cycle to complete.
• Check outdoor coil: If the outdoor coil is heavily frosted or iced, ensure airflow is not blocked by snow, leaves, or debris. Clear obstructions.
• Verify filters and coils: Clean indoor filters and coils to ensure proper airflow, which helps reduce defrost frequency.
• Sensor issues: If H1 remains indefinitely and the unit never heats, there may be a sensor or control fault; see E3/F3 procedures for coil sensors.