Daikin VRV IV+ Service Manual page 78

2 | Troubleshooting
2.3.54 H7-22-24-26 – Defective fan inverter PCB A4P
2.3.55 H9-01-02-03 – Ambient temperature thermistor R1T abnormality
Service manual
78
Main error code
H7
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
Abnormal current form
detected by fan inverter
PCB during start-up of fan
motor.
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of the outdoor unit fan motor M1F. See
4
fan motor" [ 307].
Possible cause: Faulty outdoor unit fan motor M1F.
2 Perform a check of the fan inverter PCB A4P. See
4
PCB" [ 259].
Possible cause: Faulty fan inverter PCB A4P.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
H9
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.
Sub error code
01
05
09
Effect
Unit will stop operating.
Sub error code
01
02
03
Unit
Main
Sub 1
Sub 2
Reset
Power reset at outdoor
unit.
"3.14 Outdoor unit
"3.8 Fan inverter
Unit
Main
Sub 1
Sub 2
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05