Daikin VRV EMERION RXYQ-AATJA Service Manual page 250

Troubleshooting by Error Code
Error code
U1 - 01 Reverse phase/open phase of power supply (Master)
Reverse phase/open phase of power supply
U1 - 04
(when power ON) (Master)
U1 - 05 Reverse phase/open phase of power supply (Sub)
Reverse phase/open phase of power supply
U1 - 06
(when power ON) (Sub)
U1 - 19 Power supply frequency issue (Master)
U1 - 20 Power supply frequency issue (Sub)
U2 - 01 Shortage of inverter 1 power supply voltage (Master)
U2 - 02 Open phase of inverter 1 power supply (Master)
U2 - 03 Defective capacitor in inverter 1 main circuit (Master)
U2 - 08 Shortage of inverter 1 power supply voltage (Sub)
U2 - 09 Open phase of inverter 1 power supply (Sub)
U2 - 10 Defective capacitor in inverter 1 main circuit (Sub)
U2 - 22 Shortage of inverter 2 power supply voltage (Master)
U2 - 23 Open phase of inverter 2 power supply (Master)
U2 - 24 Defective capacitor in inverter 2 main circuit (Master)
U2 - 25 Shortage of inverter 2 power supply voltage (Sub)
U2 - 26 Open phase of inverter 2 power supply (Sub)
U2 - 27 Defective capacitor in inverter 2 main circuit (Sub)
U2 - 36 Fan motor 1 undervoltage (Master)
U2 - 37 Fan motor 1 undervoltage (Sub)
U2 - 39 Fan motor 2 undervoltage (Master)
Fan motor 2 undervoltage (Sub)
U2 - 40
U3 - 02 Initial installation warning
U3 - 03 Test operation not conducted
U3 - 04 Abnormal end of test operation
Premature end of test operation during initial transmission
U3 - 05
error
Premature end of test operation during normal
U3 - 06
transmission error
Premature end of test operation due to transmission error
U3 - 07
of either unit
Premature end of test operation due to transmission error
U3 - 08
of all units
U4 - 01 Transmission error between indoor units and outdoor units Refer to the U4 flowchart and make a diagnosis of the
U4 - 03 Transmission error between indoor unit and system
Error when external control adaptor for outdoor unit is
U7 - 01
installed
Warning when external control adaptor for outdoor unit is
U7 - 02
installed
U7 - 03 Transmission error between Master and Sub units
U7 - 05 Multi system error
U7 - 06 Error in address settings of Sub unit
Connection of four or more outdoor units in the same
U7 - 07
system
U7 - 11 Error in indoor unit connection capacity for test operation
Other indoor units abnormality
U9 - 01
243
Error Description
Troubleshooting
Refer to the U1 flowchart and make a diagnosis of the
relevant unit based on the Error code shown to the left.
Make a diagnosis of the relevant unit based on the
following.
Shortage of power supply voltage
If the other units detect shortage of power supply voltage,
power supply voltage during operation may be unstable.
Check the power supply condition.
If a particular unit detects the error, operation of 52C may
be defective. Follow the U2 flowchart.
Open phase of power supply
The wiring between power supply and inverter PCB may be
disconnected. Check that power supply is connected to
terminal block, terminal block is connected to PCB without
broken wire or disconnection, and reactor wiring is
secured. If no abnormality is found, follow the U2 flowchart.
Defective capacitor in main circuit
P-N on the inverter PCB (electrolytic capacitor, power
module) may be damaged and short circuited. Operation of
current limiting relay may be defective or the wiring
between the reactor and PCB may be disconnected.
Measure the resistance between P-N on the inverter PCB
and check for short circuit. If no abnormality is found, follow
the U2 flowchart.
Refer to the U3 flowchart and make a diagnosis of the
relevant unit based on the Error code shown to the left.
relevant unit based on the Error code shown to the left.
Refer to the U7 flowchart and make a diagnosis of the
relevant unit based on the Error code shown to the left.
Refer to the U9 flowchart and make a diagnosis of the
relevant unit based on the Error code shown to the left.
SiUS342303E
Diagnosis
Part 6 Service Diagnosis