Daikin VRV IV+ Service Manual page 134

2 | Troubleshooting
2.3.122 P4-02-15-17 – Fin thermistor abnormality on fan inverter PCB A4P
Service manual
134
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
Inverter PCB A3P detects
open or short circuit or
out of range on fin
thermistor.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty fin thermistor of the PCB.
1 Check the required space around the outdoor unit heat exchanger. See
"4.3 External factors" [
Possible cause: Insufficient air flow or air by‑pass due to required space
specifications not met.
2 Perform a check of the liquid cooling expansion valve. See
4
valve" [ 244].
Possible cause: Faulty liquid cooling expansion valve.
3 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.
Main error code
P4
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.
Effect
Unit will stop operating.
of the fin
4
348].
4
372].
Sub error code
02
15
17
Reset
Manual reset via user
interface.
Automatic reset when fin
temperature is within
range.
thermistor of the
"3.7 Expansion
"3.10 Inverter PCB" [
Unit
Main
Sub 1
Sub 2
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
PCB. See
4 274].
ESIE18-15B – 2020.05