Refrigerant Shortage (Alert) - Daikin RZQG71L9V1 Service Manual

Troubleshooting by Remote Controller

4.31 Refrigerant Shortage (Alert)

U0
Remote
Controller
Display
RZQG
Applicable
Models
Refrigerant shortage is detected according to the electronic expansion valve opening degree
Method of Error
and measured temperatures and pressures.
Detection
(In cooling operation)
Error Decision
When the electronic expansion valve opens fully and low pressure is below 0.25 MPa
Conditions
continuously for 30 seconds.
(In heating operation)
When the electronic expansion valve opens fully and the suction superheat is large (more than
20°C) continuously for 60 seconds.
* Even if error occurs, operation will continue.
 Stop valve is not opened
Supposed
 Insufficient refrigerant amount
Causes
 Clogged refrigerant piping system
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the refrigerant
amount appropriate?
YES
Note:
* Refrigerant shortage alarm is indicated but operation continues.
Refer to P.194.
CHECK 9
168
NO
ESIE15-13C
Collect refrigerant. After vacuum
drying is complete, charge an
appropriate amount of
refrigerant.
CHECK 9
Check the refrigerant piping
system for clogging.
Service Diagnosis