Daikin VRV IV+ Service Manual page 60

2 | Troubleshooting
2.3.38 F4-02-04-06 – Wet alarm for compressor M1C
Service manual
60
3 Perform a check of the evaporator side expansion valve. See
4
valve" [ 244].
Possible cause: Faulty evaporator side expansion valve.
4 Check for objects near the indoor unit that may block the airflow. See
"4.3 External factors" [
Possible cause: Airflow of the indoor unit is blocked.
5 Clean the air filters of the indoor unit(s). See service manual of the respective
indoor unit(s).
Possible cause: Faulty or clogged air filter.
6 Adjust external static pressure setting for ducted type indoor units, if
necessary.
7 Perform a check of the indoor unit fan motor. See service manual of the
respective indoor unit(s).
Possible cause: Faulty indoor unit fan motor.
8 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty discharge pipe thermistor or connector fault.
9 Perform a check of the refrigerant high pressure sensor. See
high pressure sensor" [
Possible cause: Faulty refrigerant high pressure sensor.
10 Perform a check of the indoor air thermistor. See indoor unit manuals to
check thermistors on indoor units.
Possible cause: Faulty indoor air thermistor.
11 Check all indoor units operation in heating mode. Check for room
temperatures below 20°C. Check if caution disappears once rooms heat‑up. If
NOT, continue checking the cause of the wet operation.
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.
4
372].
of the discharge
4
348].
4
330].
Sub error code
02
04
06
"3.7 Expansion
pipe thermistor.
"3.17 Refrigerant
Unit
Main
Sub 1
Sub 2
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
See