Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb) - Daikin VRV RXYQ72-384XAYCA Service Manual

SiUS342004EB
3.43 Harness Abnormality (between Outdoor Unit Main PCB
and Inverter PCB)
Applicable
All outdoor unit models
Models
H3
Error Code
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 is not running.
Conditions
Supposed
 Defective connection of jumpers between PCB
Causes  Defective outdoor unit main PCB (A1P)
 Defective inverter PCB
Troubleshooting
Part 6 Service Diagnosis
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 (A4P).
300