Daikin VRV IV+ Service Manual page 62

2 | Troubleshooting
2.3.39 F4-03-05-07 – Wet alarm for compressor M2C
Service manual
62
Possible cause: Indoor room temperature too low when in heating mode. Too
cold rooms might create more subcool resulting in wet operation.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
F4
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
Discharge superheat
<10˚C for 90 minutes
(SH =T −
Discharge Discharge
T ).
condensation
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 suction pipe thermistor or connector fault.
2 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty discharge pipe thermistor or connector fault.
3 Perform a check of the refrigerant high pressure sensor. See
high pressure sensor" [
Possible cause: Faulty refrigerant high pressure sensor.
4 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant overcharge.
5 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
6 Perform a check of the evaporator side expansion valve. See
4
valve" [ 244].
Sub error code
03
05
07
Effect
Unit will stop.
of the suction
4
348].
of the discharge
4
348].
4
330].
"4.2 Refrigerant circuit" [
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
pipe thermistor.
pipe thermistor.
"3.17 Refrigerant
"4.2 Refrigerant
4
363].
"3.7 Expansion
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
See
See