5-time blink 2.5 seconds OFF — Outside temperature thermistor protection (Outdoor unit operates)

What does 5-time blink 2.5 seconds OFF (Outdoor unit operates) mean?

For MUZ-AP25/35/42 models, the outdoor unit LED blinks 5 times with a 2.5-second pause, and the unit is still operating. This indicates that the outside temperature thermistor has shorted or opened, and the unit is performing a protective operation without that thermistor.

• Outside temperature thermistor shorted or opened

Click steps to track your progress.

1. 1

   Power cycle the air conditioner by turning off the circuit breaker for 30 seconds.

2. 2

   Restore power and observe if the protection mode clears.

3. 3

   If the issue persists, a qualified technician should inspect and test the outdoor temperature thermistors.