Daikin VRV IV+ Service Manual page 64

2 | Troubleshooting
Service manual
64
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].
Possible cause: Faulty evaporator side expansion valve.
7 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.
8 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.
9 Adjust external static pressure setting for ducted type indoor units, if
necessary.
10 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.
11 Perform a check of the indoor air thermistor. See indoor unit manuals to
check thermistors on indoor units.
Possible cause: Faulty indoor air thermistor.
12 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.
of the suction
4
348].
of the discharge
4
348].
4
330].
"4.2 Refrigerant circuit" [
4
372].
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