Daikin Siesta ATXM20N2V1B - Solving Problems Based on the LED on the Outdoor Unit

8 | Troubleshooting
User reference guide
49
ATXM20~50N2V1B
Daikin room air conditioner
4P518786-2F – 2020.05
8.4 Solving problems based on the LED on the outdoor unit
LED color Normal status
Green Flashing
Red Off
On
Flashing
Off
— Any status
LED on outdoor unit printed circuit board for 2AMXM series
Green Diagnosis
Micro-computer normal / LED-A
Normal, check indoor unit
Turn the power off and on again. If the LED display
recurs, the outdoor unit PCB is faulty.
Power supply fault
(a)
(a) May NOT apply in some cases. Refer to the service manual.
LED on outdoor unit printed circuit board for 3AMXM series
Green Red Diagnosis
Micro-
compute
r normal
Malfunction detection
LED-A LED1 LED2 LED3 LED4
Normal, check indoor unit
High-pressure protector (on condenser) or low-pressure
protector (on evaporator) activated or indoor unit heat
exchanger is frozen up while the unit was operating or was in
standby mode
Overload relay activated or high discharge pipe
temperature
(a)
Faulty start of the compressor
Input overcurrent
Thermistor or current transformer abnormality
(a)
High temperature of the switchbox
High temperature at Inverter circuit heatsink
Output overcurrent
(a)
Refrigerant shortage
(a)
Low voltage to main circuit or momentary voltage loss
Reversing solenoid valve switching failure
Fan motor fault