Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb) - Daikin Aurora Series Service Manual

SiUS341802E
2.38 Harness Abnormality (between Outdoor Unit Main PCB
and Inverter PCB)
H3
Error Code
Applicable All outdoor unit models
Models
Method of Error Check for the transmission conditions of the harnesses between the PCBs using microcomputer.
Detection
Error Decision
Normal transmission between the PCBs is disabled while the compressor stops running.
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Defective connection of jumpers between PCB
Defective outdoor unit main PCB (A1P)
Defective inverter PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check for the transmission
conditions of the following
harnesses.
(1) X6A (Inverter PCB)↔X28A (A1P)
(2) X63A (Inverter PCB)↔X40A (A1P)
Harness error
NO
Replace the outdoor unit main
PCB (A1P).
H3 error recurs.
YES
YES
NO
Troubleshooting by Error Code
Return the relevant harness to
normal.
Complete countermeasures.
Replace the inverter PCB.
RXLQ-TATJU,
RXLQ-TAYDU: A3P
RXLQ-TAYCU,
RXYQ-TAYCU: A4P
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