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

Troubleshooting by Error Code
3.38 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 following jumpers between the PCB using
Detection microcomputer:
Error Decision When normal transmission between PCB is disabled during the compressor stops running.
Conditions
Supposed
Causes
Troubleshooting
233
6-10 ton
Between X28A (A1P) and X6A (A3P)
12/14 ton
Between X28A (A1P) and X6A (A3P)
Between X61A (A3P) and X6A (A6P)
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
jumpers between the PCB:
• 6–10 ton
Between X28A (A1P) and
X6A (A3P)
• 12/14 ton
Between X28A (A1P) and
X6A (A3P)
Between X61A (A3P) and
X6A (A6P)
Harness error
NO
Replace the outdoor unit main
PCB (A1P).
H3 error recurs.
YES
YES
NO
SiUS341615E
Return the relevant harness to
normal.
Complete countermeasures.
Replace the inverter PCB.
RXYQ72-120TA: A3P
RXYQ144/168TA: A3P, A6P
Service Diagnosis