Display works but shows incorrect room temperature (much higher or lower than actual), causing poor temperature control.

Safety: Unplug the unit before moving or replacing sensors.

Steps to correct temperature reading:

• Check sensor location: Ensure the room sensor is not touching the evaporator coil or positioned directly in the cold air stream. Reposition it to sense return room air.
• Inspect sensor: Look for damage to the thermistor or its wires. Replace the room temperature sensor if damaged.
• Compare with thermometer: Place an accurate thermometer near the unit's intake and compare readings. If the AC reading is consistently off by a large margin with a new sensor, the main control board may be miscalibrated and require replacement.