Daikin VRV IV+ Service Manual page 74

2 | Troubleshooting
2.3.49 H3-02-04-06 – Transmission error between main PCB A1P and inverter PCB A3P
Service manual
74
Possible cause: Faulty expansion valve, loose connector, faulty expansion
valve coil.
4 Perform a check of the branch selector box PCB. See
4
box PCB" [ 214].
Possible cause: Faulty branch selector box PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
H3
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Transmission abnormality
between outdoor unit
main PCB and inverter
PCB A3P.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check wiring between main PCB and inverter PCB.
2 Check if connector X40A is correctly inserted. See
4
diagram" [ 385].
Possible cause: Incorrect wiring.
3 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
4 Perform a check of the inverter PCB A3P. See
Possible cause: Faulty inverter PCB A3P.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Sub error code
02
04
06
Effect
Unit will stop operating.
"3.11 Main
"3.10 Inverter
"3.2.1 Branch selector
Unit
Main
Sub 1
Sub 2
Reset
Power reset at outdoor
unit.
"6.2 Wiring
4
PCB" [ 290].
4
PCB" [ 274].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05