List Of Inverter-Related Error Codes - Daikin RXSQ24TAVJU Service Manual

SiUS331708EA
5.8

List of Inverter-Related Error Codes

CHECK 9
Code
L5
Instantaneous overcurrent of
inverter compressor
L8 Overcurrent of inverter
compressor
(Electronic superheating
protection sensor)
E5 Inverter compressor lock
L1
Defective PCB (for inverter
compressor)
L4 Radiation fin temperature rise
L9 Defective startup of inverter
compressor
LC Transmission error (between
microcomputers on the outdoor
main PCB)
P1 Imbalanced power supply
P4 Defective radiation fin thermistor
U2 Power supply voltage error
Service Diagnosis
Name
• Inverter output current exceeds 59.1 A even
instantaneously.
• Compressor overload running
A current of 33.5 A or more continues for a
period of consecutive 5 seconds or that of
27.6 A or more continues for a period of
consecutive 260 seconds.
• The inverter loses synchronization.
• The compressor is in the locked status (does
not rotate).
• No output is given.
• The radiation fin temperature reaches 87°C
(188°F) or more (while in operation).
• The compressor motor fails to start up.
• No communications are carried out across the
microcomputers on the outdoor main PCB.
• Power supply voltages get significantly
imbalanced among three phases.
• The radiation fin thermistor gets short circuited
or open.
• The inverter power supply voltage is high or
low.
Condition for determining error Major cause
• Liquid sealing
• Defective compressor
• Defective inverter PCB
• Back-flow of compressor liquid
• Sudden changes in loads
• Disconnected compressor wiring
• Defective PCB
• Defective compressor
• Defective heavy current part of
compressor
• Defective fan
• Running in overload for an
extended period of time
• Defective PCB
• Liquid sealing or defective
compressor
• Excessive oil or refrigerant
• Defective PCB
• Defective outdoor main PCB
• Power supply error (imbalanced
voltages of 2% or more)
• Defective PCB
• Dead PCB
• Defective radiation fin thermistor
• Power supply error
• Defective PCB
Check
264