Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 198

Troubleshooting by Remote Controller
CHECK 10
Concept of inverter-related error codes
Power supply
(3 phase, 460VAC)
(3 phase, 230VAC)
U2 P1
Imbalanced power supply voltage
When imbalance in
voltages among three
phases comes to 2%
or more
Power supply voltage error
When the power supply
voltage falls out of the
range of 460VAC±10%
230VAC±10%
Error codes related to
compressor current
188
Main (Service monitor) PCB
LC
Weak-current
part
Heavy-current
part (Power
transmission etc.)
L1 P4
Radiation fin temperature rise
Defective radiation fin thermistor
When the radiation fin thermistor resistor detects
an open circuit (-22˚F or less) or a short
circuit (248˚F or more)
Defective radiation inverter
When the radiation heavy current part of
inverter gets defective (gives no output)
Instantaneous
overcurrent
460V: 32.3A
(230V: 59.1A)
460V: 19.0A
(230V: 33.5A)
5 consecutive sec.
460V: 16.1A
(230V: 27.6A)
Inverter
PCB
L5 L8
L4 PJ
PCB mismatching
When incorrect inverter
PCB is connected
When the radiation fin
temperature reached
199.4˚F or more
L5
Compressor overcurrent
(Electronic thermal 2)
260 consecutive sec.
Transmission error
When transmissions between the
main PCB and the inverter PCB
are not normal
Instantaneous overcurrent of inverter compressor
(When inverter output current exceeds 460V units:
32.3A 230V units: 59.1A even instantaneously)
Overcurrent of inverter compressor
For 460V units
An overcurrent of 19.0A or more continues
for a period of 5 consecutive seconds
An overcurrent of 16.1A or more continues
for a period of 260 consecutive seconds.
For 230V units
A current of 33.5A or more continues for a
period of consecutive 5 sec.
A current of 27.6A or more continues for a
period of consecutive 260 sec.
E5 L9
Defective startup of inverter compressor
(Compressor stops running
immediately after it starts up.)
Inverter compressor lock
(Compressor does not run at all.)
L8
Compressor overcurrent
(Electronic thermal 1)
Max. control
Time
Service Diagnosis
SiBE341027
L8