When you press and hold the upper compartment button and lower compartment button simultaneously for one second, all LED’s will turn on if the open-air sensor is operating normally. If there’s a problem with the open-air sensor all LED’s will turn on except for the malfunction diagnoses display.

Cause

The Main board has stopped receiving a feedback signal from the Open-air sensor, (ambient sensor).

Solution

Check The connections at the sensor and the Main PCB.