Gas Shortage (Malfunction) - Daikin RZQ71~125B7V3B Service Manual

ESIE04-01
3.22 Gas Shortage (Malfunction) (U0)
U0
Remote Controller
Display
Method of (In test operation)
Malfunction Detection by closed stop valve.
Detection
(In normal operation)
Gas shortage is detected according to the discharge pipe temperature.
Malfunction (In test operation)
Decision Variations of the indoor unit heat exchange temperature judge whether stop valve is open or closed.
Conditions
(In normal operation)
When microcomputer judges and detects gas shortage.
*
Gas shortage is not decided repeating retry. When INSPECTION button on the remote controller is
pushed, "U0" is displayed.
Supposed Causes
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
The stop valve is left in closed.
Insufficient refrigerant amount
Clogged refrigerant piping system
Is the stop valve open?
YES
Is the refrigerant
amount appropriate?
YES
For RZQ71~125 models, gas shortage alarm is indicated but operation continues. On
other models than aforementioned, operation halts due to malfunction.
NO
Open the stop valve.
NO
Collect refrigerant. After vacuum
drying is complete, charge
a appropriate amount of refrigerant.
Check NO. 7
Check the refrigerant piping system
for clogging.
Error Codes: Outdoor Units
(S2602)
3–85
1
3 3
4
5