Unit blows warm air in cooling mode or cold air in heating mode (for heat pump models) intermittently.

Safety: Unplug the unit before accessing internal components. Reversing valve service involves refrigerant and should be done by a licensed technician.

Steps:

• 1. Confirm mode: Verify that the unit is set to the correct mode (Cool vs. Heat) and that the display matches your selection.
• 2. Listen for valve shift: When switching between heating and cooling, you should hear a distinct whoosh or click from the reversing valve area. If not, the valve may be stuck or not energized.
• 3. Check coil voltage (technician-level): With power on and in the correct mode, a technician can check for 24V or control voltage at the reversing valve coil. Replace the coil if it is open or not energizing.
• 4. Valve or refrigerant issues: If the coil is good but the valve does not shift, or if performance is poor in both modes, a refrigerant or valve problem exists and requires professional service.