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Troubleshooting
Service manual
135
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Trigger
Effect
Reset
Fan inverter PCB A4P
detects open or short
circuit or out of range on
fin thermistor.
Unit will stop operating.
Manual reset via user
interface.
Automatic reset when fin
temperature is within
range.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Perform
a
check
of
the
fin
thermistor
of
the
PCB.
See
Possible cause:
Faulty fin thermistor of the PCB.
1
Check the required space around the outdoor unit heat exchanger. See
372].
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
Possible cause:
Faulty liquid cooling expansion valve.
3
Perform a check of the fan inverter PCB A4P. See
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.
2.3.123 P4-03-16-18 – Fin thermistor abnormality on fan inverter PCB A7P
Main error code
Sub error code
Unit
P4
03
Main
16
Sub 1
18
Sub 2
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.
Summary of Contents for VRV IV+
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