Indoor unit displays F2 and may stop cooling or heating

Safety first: Turn off power before removing the indoor front cover and accessing the coil area.

Steps to try:

• Locate coil sensor: The evaporator sensor is typically clipped to the copper tubing or embedded in the coil fins near the center of the indoor coil.
• Check mounting: Ensure the sensor is firmly attached to the coil surface; a loose sensor can misread temperature.
• Inspect wiring: Follow the sensor wires back to the PCB, checking for cuts, pinches, or loose plugs.
• Reconnect and reset: Reseat the connector on the PCB, restore power, and test. If F2 persists, the sensor likely needs replacement.

When to call a pro: If a new sensor does not resolve F2, the indoor PCB may be defective.