Daikin RQYQ140-180PY1 Service Manual page 207

R-410a heat pump 50hz and r-410a heat recovery 50hz
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SiBE341001
CHECK 10
Concept of inverter-related malfunction codes
Power supply
(3 phase, 400VAC)
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 400VAC±10%
Malfunction codes related
to compressor current
Troubleshooting
Main (Control) PCB
LC
Weak-current
part
Heavy-current
part (Power
transmission etc.)
L1
P4
Radiator fin temperature rise
Faulty fin thermistor
When the fin thermistor resistor detects
an open circuit (-30˚C or less) or a short
circuit (120˚C or more)
Faulty inverter
When the heavy current part of
inverter gets faulty (gives no output)
Instantaneous
overcurrent
32.3A
19.0A
5 consecutive sec.
16.1A
Inverter
PCB
L5
L8
L4
PJ
PCB mismatching
When incorrect inverter
PCB is connected
When the radiator fin
temperature reached
93˚C or more
L5
Compressor overcurrent
(Electronic thermal 2)
260 consecutive sec.
Troubleshooting by Remote Controller
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 32.3A
even instantaneously)
Overcurrent of inverter compressor
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.
E5
L9
Faulty 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
L8
198

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