Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb) - Daikin VRV EMERION REYQ-AATJA Service Manual

Troubleshooting by Error Code
3.50 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
391
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 harnesses
connecting the main PCB to
inverter PCB.
Harness error
NO
Replace the outdoor unit main
PCB (A1P).
H3 error recurs.
YES
YES
NO
SiUS372201EB
Return the relevant harness to
normal.
Complete countermeasures.
Replace the inverter PCB.
Part 6 Service Diagnosis