Indoor unit stops cooling or heating; fan may run; H14 displayed indicating temperature sensor fault.

Safety first: Disconnect power at the breaker before removing the indoor unit cover.

Steps to check:

• 1. Access the thermistor: Remove the front panel and filters. Locate the room temperature sensor (small probe or bead-type thermistor) usually clipped near the indoor coil or air intake.
• 2. Inspect wiring and connector: Ensure the thermistor leads are not broken and the connector is firmly seated on the indoor PCB. Reseat the connector.
• 3. Check sensor placement: The thermistor should be in free air flow, not touching metal surfaces or insulation. Reposition if displaced.
• 4. Basic resistance check (optional): With power OFF, disconnect the thermistor and measure resistance with a multimeter. Compare to Panasonic service data (typically 5–20 kΩ depending on temperature). Infinite or near-zero resistance indicates a bad sensor.
• 5. Replace if faulty: If the thermistor is open/shorted or physically damaged, replace it with a Panasonic-compatible indoor room thermistor.

If H14 persists after sensor replacement and wiring checks, the indoor PCB sensor circuit may be defective and should be replaced by a professional.